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Van der Heyden J, Leclercq V, Duysburgh E, Cornelissen L, Desombere I, Roukaerts I, Gisle L. Prevalence of SARS-CoV-2 antibodies and associated factors in the adult population of Belgium: a general population cohort study between March 2021 and April 2022. Arch Public Health 2024; 82:72. [PMID: 38750563 PMCID: PMC11094959 DOI: 10.1186/s13690-024-01298-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 04/29/2024] [Indexed: 05/19/2024] Open
Abstract
BACKGROUND This study assessed seroprevalence trends of SARS-CoV-2 antibodies in the Belgian adult population between March 2021 and April 2022, and explored factors associated with seropositivity and seroreversion among the vaccinated and unvaccinated population. METHODS A prospective longitudinal surveillance study was conducted within a random sample of the general population (18 + years) in Belgium, selected from the national register through a multistage sampling design. Participants provided a saliva sample and completed a survey questionnaire on three occasions: at baseline and in two follow-up waves. Outcome variables included (1) seropositivity, defined as the presence of SARS-CoV-2 antibodies, assessed with a semi-quantitative measure of anti-RBD (Receptor Binding Domain) IgG ELISA and (2) seroreversion, defined as passing from a positive to a negative antibody test between two measurements. Trends in SARS-CoV-2 antibody prevalence were assessed using binary logistic regression with contrasts applying post-stratification. Potential determinants of seropositivity were assessed through multilevel logistic regressions. RESULTS In total 6,178 valid observations were obtained from 2,768 individuals. SARS-CoV-2 antibody prevalence increased from 25.1% in the beginning of the study period to 92.3% at the end. Among the vaccinated population, factors significantly associated with higher seropositivity rates were being younger, having a bachelor diploma, living with others, having had a vaccine in the last 3 months and having received a nucleic-acid vaccine or a combination. Lower seropositivity rates were observed among vaccinated people with a neurological disease and transplant patients. Factors significantly associated with higher seropositivity rates among the unvaccinated population were having non-O blood type and being non-smoker. Among vaccinated people, the seroreversion rate was much lower (0.3%) in those who had received their latest vaccine in the last 3 months compared to those who had received their latest vaccine more than 3 months ago (2.7%) (OR 0.13; 95%CI 0.04-0.42). CONCLUSIONS The rapid increase in antibody seropositivity in the general adult population in Belgium during the study period was driven by the vaccination campaign which ran at full speed during this period. Among vaccinated people, seropositivity varied in function of the time since last vaccine, the type of vaccine, sociodemographic features and health status.
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Affiliation(s)
- Johan Van der Heyden
- Epidemiology and public health, Sciensano Juliette Wytsmanstraat 14, Sciensano, Brussels, 1050, Belgium.
| | - Victoria Leclercq
- Epidemiology and public health, Sciensano Juliette Wytsmanstraat 14, Sciensano, Brussels, 1050, Belgium
| | - Els Duysburgh
- Epidemiology and public health, Sciensano Juliette Wytsmanstraat 14, Sciensano, Brussels, 1050, Belgium
| | - Laura Cornelissen
- Epidemiology and public health, Sciensano Juliette Wytsmanstraat 14, Sciensano, Brussels, 1050, Belgium
| | | | | | - Lydia Gisle
- Epidemiology and public health, Sciensano Juliette Wytsmanstraat 14, Sciensano, Brussels, 1050, Belgium
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O’Brien SF, Deeks SL, Hatchette T, Pambrun C, Drews SJ. SARS-CoV-2 seroprevalence in Nova Scotia blood donors. JOURNAL OF THE ASSOCIATION OF MEDICAL MICROBIOLOGY AND INFECTIOUS DISEASE CANADA = JOURNAL OFFICIEL DE L'ASSOCIATION POUR LA MICROBIOLOGIE MEDICALE ET L'INFECTIOLOGIE CANADA 2024; 9:32-45. [PMID: 38567363 PMCID: PMC10984316 DOI: 10.3138/jammi-2023-0017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 10/20/2023] [Accepted: 11/09/2023] [Indexed: 04/04/2024]
Abstract
Background SARS-CoV-2 seroprevalence monitors cumulative infection rates irrespective of case testing protocols. We aimed to describe Nova Scotia blood donor seroprevalence in relation to public health policy and reported data over the course of the COVID-19 pandemic (May 2020 to August 2022). Methods Monthly random Nova Scotia blood donation samples (24,258 in total) were tested for SARS-CoV-2 infection antibodies (anti-nucleocapsid) from May 2020 to August 2022, and vaccination antibodies (anti-spike) from January 2021 to August 2022. Multivariable logistic regression for infection antibodies and vaccination antibodies separately with month, age, sex, and racialization identified independent predictors. The provincial nucleic acid amplification test (NAAT)-positive case rate over the pandemic was calculated from publicly available data. Results Anti-N seroprevalence was 3.8% in January 2022, increasing to 50.8% in August 2022. The general population COVID-19 case rate was 3.5% in January 2022, increasing to 12.5% in August 2022. The percentage of NAAT-positive samples in public health laboratories increased from 1% in November 2021 to a peak of 30.7% in April 2022 with decreasing numbers of tests performed. Higher proportions of younger donors as well as Black, Indigenous, and racialized blood donors were more likely to have infection antibodies (p < 0.01). Vaccination antibodies increased to 100% over 2021, initially in older donors (60+ years), and followed by progressively younger age groups. Conclusions SARS-CoV-2 infection rates were relatively low in Nova Scotia until the more contagious Omicron variant dominated, after which about half of Nova Scotia donors had been infected despite most adults being vaccinated (although severity was much lower in vaccinated individuals). Most COVID-19 cases were detected by NAAT until Omicron arrived. When NAAT testing priorities focused on high-risk individuals, infection rates were better reflected by seroprevalence.
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Affiliation(s)
- Sheila F O’Brien
- Epidemiology & Surveillance, Canadian Blood Services, Ottawa, Ontario, Canada
- School of Epidemiology & Public Health, University of Ottawa, Ontario, Canada
| | - Shelley L Deeks
- Department of Health and Wellness, Government of Nova Scotia, Halifax, Nova Scotia, Canada
- Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Todd Hatchette
- Division of Microbiology, Nova Scotia Health, Central Zone, Halifax, Nova Scotia, Canada
- Department of Pathology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Chantale Pambrun
- Medical Affairs & Innovation, Canadian Blood Services, Ottawa, Ontario, Canada
| | - Steven J Drews
- Microbiology, Canadian Blood Services, Edmonton, Alberta, Canada
- Department of Pathology & Laboratory Medicine, University of Alberta, Edmonton, Alberta, Canada
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Misra P, Garg PK, Awasthi A, Kant S, Rai SK, Ahmad M, Guleria R, Deori TJ, Mandal S, Jaiswal A, Gongal G, Vishwakarma S, Bairwa M, Kumar R, Haldar P, Binayke A. Cell-Mediated Immunity (CMI) for SARS-CoV-2 Infection Among the General Population of North India: A Cross-Sectional Analysis From a Sub-sample of a Large Sero-Epidemiological Study. Cureus 2023; 15:e48824. [PMID: 38106811 PMCID: PMC10722242 DOI: 10.7759/cureus.48824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/13/2023] [Indexed: 12/19/2023] Open
Abstract
Background Cell-mediated immunity (CMI), or specifically T-cell-mediated immunity, is proven to remain largely preserved against the variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), including Omicron. The persistence of cell-mediated immune response in individuals longitudinally followed up for an extended period remains largely unelucidated. To address this, the current study was planned to study whether the effect of cell-mediated immunity persists after an extended period of convalescence or vaccination. Methods Whole blood specimens of 150 selected participants were collected and tested for Anti-SARS-CoV-2 Interferon-gamma (IFN-γ) response. Ex vivo SARS-CoV-2-specific interferon-gamma Enzyme-linked Immunospot (IFN-γ ELISpot) assay was carried out to determine the levels of virus-specific IFN-γ producing cells in individual samples. Findings Out of all the samples tested for anti-SARS-CoV-2 T-cell-mediated IFN-γ response, 78.4% of samples were positive. The median (interquartile range) spots forming units (SFU) per million levels of SARS-CoV-2-specific IFN-γ producing cells of the vaccinated and diagnosed participants was 336 (138-474) while those who were vaccinated but did not have the disease diagnosis was 18 (0-102); the difference between the groups was statistically significant. Since almost all the participants were vaccinated, a similar pattern of significance was observed when the diagnosed and the never-diagnosed participants were compared, irrespective of their vaccination status. Interpretations Cell-mediated immunity against SARS-CoV-2 persisted, irrespective of age and sex of the participant, for more than six months of previous exposure. Participants who had a history of diagnosed COVID-19 infection had better T-cell response compared to those who had never been diagnosed, in spite of being vaccinated.
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Affiliation(s)
- Puneet Misra
- Epidemiology and Public Health, Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Pramod K Garg
- Gastroenterology, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Amit Awasthi
- Allergy and Immunology, Centre for Immunobiology and Immunotherapy, Translational Health Science and Technology Institute, Faridabad, IND
| | - Shashi Kant
- Epidemiology and Public Health, Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Sanjay K Rai
- Epidemiology and Public Health, Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Mohammad Ahmad
- Epidemiology and Public Health, World Health Organization, New Delhi, IND
| | - Randeep Guleria
- Pulmonary, Critical Care, and Sleep Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Trideep J Deori
- Epidemiology and Public Health, Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Suprakash Mandal
- Epidemiology and Public Health, Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Abhishek Jaiswal
- Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Gaurav Gongal
- Epidemiology and Public Health, Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Siddhesh Vishwakarma
- Allergy and Immunology, Immunology Core Laboratory, Translational Health Science and Technology Institute, Faridabad, IND
| | - Mohan Bairwa
- Epidemiology and Public Health, Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Rakesh Kumar
- Epidemiology and Public Health, Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Partha Haldar
- Preventive Medicine, Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, New Delhi, IND
| | - Akshay Binayke
- Allergy and Immunology, Centre for Immunobiology and Immunotherapy, Translational Health Science and Technology Institute, Faridabad, IND
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Provencio M, Estival A, Franco F, López-Vivanco G, Saigí M, Arasanz H, Diz P, Carcereny E, García J, Aguado C, Mosquera J, Iruarrizaga E, Majem M, Bosch-Barrera J, Mielgo-Rubio X, Guirado M, Juan-Vidal Ó, Blasco A, Lucía Gozálvez C, Del Barrio A, De Portugal T, López-Martín A, Serrano G, Campos B, Rubio J, Catot S, Esteban B, Martí-Ciriquian JL, Del Barco E, Calvo V. Immunogenicity of COVID-19 vaccines in lung cancer patients. Lung Cancer 2023; 184:107323. [PMID: 37639820 DOI: 10.1016/j.lungcan.2023.107323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 08/05/2023] [Indexed: 08/31/2023]
Abstract
OBJECTIVE Patients with lung cancer are at increased risk of SARS-CoV-2 infection and severe complications from COVID-19, but information on the efficacy of anti-SARS-CoV-2 vaccine in these patients is scarce. We aimed at evaluating the safety and immunogenicity of COVID-19 vaccines in this population. PATIENTS AND METHODS The prospective, nationwide SOLID substudy, enrolled adults with lung cancer who were fully vaccinated against COVID-19. Serum anti-SARS-CoV-2 IgG antibody levels were quantitatively assessed two weeks and six months after receipt of the last dose using a chemiluminescent microparticle immunoassay. Multivariate odds ratios for the association between demographic and clinical factors and seronegativity after vaccination were estimated. RESULTS 1973 lung cancer patients were enrolled. Most patients had stage IV disease (66%) and were receiving active cancer treatment (82.7%). No significant differences were found in the probability of being seronegative for anti-SARS-CoV-2 IgG antibodies after full vaccination between patients who were receiving active cancer treatment and those who were not (p = 0.396). The administration of immunotherapy or oral targeted therapy and immunization with mRNA-1273 COVID-19 vaccine were factors independently associated with increased odds of being seropositive after vaccination. From all patients, 1405 received the second dose of vaccine and high levels of antibody titers were observed in 93.6% of patients two weeks after second dose. At six months, multivariate logistic regression analysis showed that performance status ≥ 2 was independently associated with a higher probability of being seronegative after full vaccination with an OR 4.15. On the other hand, received chemotherapy or oral target therapy and vaccination with mRNA-1273 were a factor independently associated with lower odds of being seronegative after full vaccination with an OR 0.52, 0.37 and 0.34, respectively. CONCLUSIONS Lung cancer patients can safely achieve a strong immune response against SARS-CoV-2 after full vaccination, regardless of the cancer treatment received. TRIAL REGISTRATION NCT04407143.
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Affiliation(s)
- Mariano Provencio
- Medical Oncology Department, Hospital Universitario Puerta de Hierro-Majadahonda, Madrid, Spain.
| | - Anna Estival
- Medical Oncology Department, Catalan Institute of Oncology, Hospital Universitari Germans Trias i Pujol, B-ARGO, IGTP, Badalona, Spain
| | - Fernando Franco
- Medical Oncology Department, Hospital Universitario Puerta de Hierro-Majadahonda, Madrid, Spain
| | | | - María Saigí
- Medical Oncology Department, Catalan Institute of Oncology, Hospital Universitari Germans Trias i Pujol, B-ARGO, IGTP, Badalona, Spain
| | - Hugo Arasanz
- Medical Oncology Department, Hospital Universitario de Navarra - Oncoimmunology, Navarrabiomed, Pamplona, Spain
| | - Pilar Diz
- Medical Oncology Department, Complejo Asistencial Universitario de León, León, Spain
| | - Enric Carcereny
- Medical Oncology Department, Catalan Institute of Oncology, Hospital Universitari Germans Trias i Pujol, B-ARGO, IGTP, Badalona, Spain
| | - Javier García
- Medical Oncology Department, Hospital Universitari Son LLàtzer, Palma de Mallorca, Spain
| | - Carlos Aguado
- Medical Oncology Department, Hospital Clínico San Carlos, Madrid, Spain
| | - Joaquín Mosquera
- Medical Oncology Department, Complejo Hospitalario Universitario A Coruña, A Coruña, Spain
| | - Eluska Iruarrizaga
- Medical Oncology Department, Hospital Universitario Cruces, Barakaldo, Spain
| | - Margarita Majem
- Medical Oncology Department, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | | | - Xavier Mielgo-Rubio
- Medical Oncology Department, Hospital Universitario Fundación Alcorcón, Madrid, Spain
| | - María Guirado
- Medical Oncology Department, Hospital General Universitario de Elche, Alicante, Spain
| | - Óscar Juan-Vidal
- Medical Oncology Department, Hospital Universitario y Politécnico La Fe, Valencia, Spain
| | - Ana Blasco
- Medical Oncology Department, Hospital General Universitario de Valencia, CIBERONC, Valencia, Spain
| | - Clara Lucía Gozálvez
- Medical Oncology Department, Hospital Universitari Sant Joan de Reus, Reus, Spain
| | - Anabel Del Barrio
- Medical Oncology Department, Hospital Universitario HM Sanchinarro, Madrid, Spain
| | - Teresa De Portugal
- Medical Oncology Department, Complejo Hospitalario de Zamora, Zamora, Spain
| | - Ana López-Martín
- Medical Oncology Department, Hospital Universitario Severo Ochoa, Madrid, Spain
| | - Gloria Serrano
- Medical Oncology Department, Hospital Universiario Infanta Leonor, Madrid, Spain
| | - Begoña Campos
- Medical Oncology Department, Hospital Universitario Lucus Augusti, Lugo, Spain
| | - Judit Rubio
- Medical Oncology Department, Hospital Universitario de Móstoles, Madrid, Spain
| | - Silvia Catot
- Medical Oncology Department, Althaia, Xarxa Assistencial Universitària Manresa, Barcelona, Spain
| | - Beatriz Esteban
- Medical Oncology Department, Hospital General Universitario de Segovia, Segovia, Spain
| | | | - Edel Del Barco
- Medical Oncology Department, Hospital Clínico Universitario de Salamanca, Salamanca, Spain
| | - Virginia Calvo
- Medical Oncology Department, Hospital Universitario Puerta de Hierro-Majadahonda, Madrid, Spain
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Sulcebe G, Ylli A, Kurti-Prifti M, Ylli Z, Shyti E, Dashi-Pasholli J, Cenko F. Rapid increase of SARS-CoV-2 seroprevalence during the second half of the COVID-19 pandemic year 2020 in the adult urban Albanian population. Heliyon 2023; 9:e19547. [PMID: 37681122 PMCID: PMC10481283 DOI: 10.1016/j.heliyon.2023.e19547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 08/08/2023] [Accepted: 08/25/2023] [Indexed: 09/09/2023] Open
Abstract
Background This study aims to assess the changes in COVID-19 seroprevalence among the adult urban population of Albania between July and December 2020, when the Wuhan strain of SARS-CoV-2 virus was still prevalent in the country. Methods Two independent, randomly selected samples of individuals aged 20-70 years residing in Metropolitan Tirana, Albania, were collected in June-July and December 2020. ELISA method was used for serological testing to determine IgG antibodies anti-S1-SARS-CoV-2. Results: The proportion of individuals classified as seropositive in early July was 7.5% (95% CI: 4.3%-10.7%), which increased 6.5 times in late December 2020, reaching 48.2% (95% CI: 44.8%-51.7%). The increasing seroprevalence rates in the study mirrored the trend of detected COVID-19 cases from June to December 2020 in Albania. However, they demonstrate a much higher cumulative incidence of the SARS-COV-2 infection in the community than the reported COVID-19 cases. Conclusion: The rapid increase in SARS-CoV-2 seroprevalence observed in Tirana City by the end of 2020 was likely a result of several factors, including the very low infection exposure between March-May 2020 when the entire city was in a lockdown, followed by the high susceptibility of the population due to naïve immunity. Despite the high observed seroprevalence at the end of December 2020, COVID-19 incidence continued to increase in Albania through 2021 and 2022 following the new virus variant surges.
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Affiliation(s)
- Genc Sulcebe
- Research Unit of Immunology, University of Medicine of Tirana and University Hospital Center of Tirana, Albania
- Academy of Sciences of Albania, Albania
| | | | - Margarita Kurti-Prifti
- Research Unit of Immunology, University of Medicine of Tirana and University Hospital Center of Tirana, Albania
| | - Zamira Ylli
- Research Unit of Immunology, University of Medicine of Tirana and University Hospital Center of Tirana, Albania
| | - Erkena Shyti
- Research Unit of Immunology, University of Medicine of Tirana and University Hospital Center of Tirana, Albania
| | - Jonida Dashi-Pasholli
- Research Unit of Immunology, University of Medicine of Tirana and University Hospital Center of Tirana, Albania
| | - Fabian Cenko
- Catholic University “Our Lady of Good Counsel” Tirana, Albania
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Watts AW, Mâsse LC, Goldfarb DM, Irvine MA, Hutchison SM, Muttucomaroe L, Poon B, Barakauskas VE, O'Reilly C, Bosman E, Reicherz F, Coombs D, Pitblado M, O'Brien SF, Lavoie PM. SARS-CoV-2 cross-sectional seroprevalence study among public school staff in Metro Vancouver after the first Omicron wave in British Columbia, Canada. BMJ Open 2023; 13:e071228. [PMID: 37308276 DOI: 10.1136/bmjopen-2022-071228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/14/2023] Open
Abstract
OBJECTIVE To determine the SARS-CoV-2 seroprevalence among school workers within the Greater Vancouver area, British Columbia, Canada, after the first Omicron wave. DESIGN Cross-sectional study by online questionnaire, with blood serology testing. SETTING Three main school districts (Vancouver, Richmond and Delta) in the Vancouver metropolitan area. PARTICIPANTS Active school staff enrolled from January to April 2022, with serology testing between 27 January and 8 April 2022. Seroprevalence estimates were compared with data obtained from Canadian blood donors weighted over the same sampling period, age, sex and postal code distribution. PRIMARY AND SECONDARY OUTCOMES SARS-CoV-2 nucleocapsid antibody testing results adjusted for test sensitivity and specificity, and regional variation across school districts using Bayesian models. RESULTS Of 1850 school staff enrolled, 65.8% (1214/1845) reported close contact with a COVID-19 case outside the household. Of those close contacts, 51.5% (625/1214) were a student and 54.9% (666/1214) were a coworker. Cumulative incidence of COVID-19 positive testing by self-reported nucleic acid or rapid antigen testing since the beginning of the pandemic was 15.8% (291/1845). In a representative sample of 1620 school staff who completed serology testing (87.6%), the adjusted seroprevalence was 26.5% (95% CrI 23.9% to 29.3%), compared with 32.4% (95% CrI 30.6% to 34.5%) among 7164 blood donors. CONCLUSION Despite frequent COVID-19 exposures reported, SARS-CoV-2 seroprevalence among school staff in this setting remained no greater than the community reference group. Results are consistent with the premise that many infections were acquired outside the school setting, even with Omicron.
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Affiliation(s)
- Allison W Watts
- BC Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
| | - Louise C Mâsse
- BC Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- School of Population and Public Health, The University of British Columbia, Vancouver, British Columbia, Canada
| | - David M Goldfarb
- BC Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pathology and Laboratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Mike A Irvine
- British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada
| | - Sarah M Hutchison
- BC Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
| | - Lauren Muttucomaroe
- Department of Pediatrics, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
| | - Bethany Poon
- Department of Pediatrics, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
| | - Vilte E Barakauskas
- Department of Pathology and Laboratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
| | | | - Else Bosman
- BC Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
| | - Frederic Reicherz
- BC Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
| | - Daniel Coombs
- Department of Mathematics and Institute of Applied Mathematics, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Mark Pitblado
- BC Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
| | - Sheila F O'Brien
- Canadian Blood Services, Ottawa, Ontario, Canada
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, Ontario, Canada
| | - Pascal M Lavoie
- BC Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, The University of British Columbia Faculty of Medicine, Vancouver, British Columbia, Canada
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Atef S, Al Hosani F, AbdelWareth L, Al-Rifai RH, Abuyadek R, Jabari A, Ali R, Altrabulsi B, Dunachie S, Alatoom A, Donnelly JG. Susceptibility to reinfection with SARS-CoV-2 virus relative to existing antibody concentrations and T cell response. Int J Infect Dis 2023; 131:100-110. [PMID: 36702370 PMCID: PMC9870609 DOI: 10.1016/j.ijid.2023.01.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 01/02/2023] [Accepted: 01/03/2023] [Indexed: 01/25/2023] Open
Abstract
OBJECTIVES We investigated the reinfection rate of vaccinated or convalescent immunized SARS-CoV-2 in 952 expatriate workers with SARS-CoV-2 serological antibody (Ab) patterns and surrogate T cell memory at recruitment and follow-up. METHODS Trimeric spike, nucleocapsid, and neutralizing Abs were measured, along with a T cell stimulation assay, targeting SARS-CoV-2 memory in clusters of differentiation (CD) 4+ and CD8+ T cells. The subjects were then followed up for reinfection for up to 6 months. RESULTS The seroprevalence positivity at enrollment was greater than 99%. The T cell reactivity in this population was 38.2%. Of the 149 (15.9%) participants that were reinfected during the follow-up period (74.3%) had nonreactive T cells at enrollment. Those who had greater than 100 binding Ab units/ml increase from the median concentration of antispike immunoglobulin G Abs had a 6% reduction in the risk of infection. Those who were below the median concentration had a 78% greater risk of infection. CONCLUSION Significant immune protection from reinfection was observed in those who retained T cell activation memory. Additional protection was observed when the antispike was greater than the median value.
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Affiliation(s)
- Shereen Atef
- National Reference Laboratory, Abu Dhabi, United Arab Emirates; Faculty of Medicine, Ain Shams University, Cairo, Egypt.
| | | | - Laila AbdelWareth
- National Reference Laboratory, Abu Dhabi, United Arab Emirates; Cleveland Clinic, Abu Dhabi, United Arab Emirates
| | - Rami H Al-Rifai
- Institute of Public Health, College of Medicine and Health Sciences, Abu Dhabi, United Arab Emirates
| | - Rowan Abuyadek
- Abu Dhabi Public Health Center, Abu Dhabi, United Arab Emirates; High Institute of Public Health, Alexandria University, Alexandria, Egypt
| | - Andrea Jabari
- New-York University, Abu Dhabi, United Arab Emirates
| | - Raghib Ali
- New-York University, Abu Dhabi, United Arab Emirates; MRC Epidemiology Unit, University of Cambridge, Cambridge, United Kingdom
| | - Basel Altrabulsi
- National Reference Laboratory, Abu Dhabi, United Arab Emirates; Cleveland Clinic, Abu Dhabi, United Arab Emirates
| | | | - Adnan Alatoom
- National Reference Laboratory, Abu Dhabi, United Arab Emirates; Cleveland Clinic, Abu Dhabi, United Arab Emirates
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Putekova S, Martinkova J, Urickova A, Kober L, Reichertova S, Plancikova D, Majdan M. The impact of the COVID-19 pandemic on the health and working conditions of nurses and its implications for policies: a cross-sectional study in Slovakia. BMC Nurs 2023; 22:185. [PMID: 37248500 DOI: 10.1186/s12912-023-01356-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 05/25/2023] [Indexed: 05/31/2023] Open
Abstract
BACKGROUND Increased workload and of the health workforce (HW) strained the capacity to maintain essential health services (EHS) during the Coronavirus Disease 2019 (COVID-19) pandemic, while putting them at increased risk of COVID-19 and other consequences to their health. The aim of this study was to assess the impact of COVID-19 on the health, wellbeing, and working conditions of nurses in Slovakia and to identify gaps in policies to be addressed to increase preparedness of the HW for future emergencies. METHODS A nation-wide cross-sectional study was conducted among nurses during November-December 2021, referring to the period of January 2021 to November 2021. To assess the differences between impact on HW on various levels of care, respondents were grouped by type of facility: hospital-COVID-19 wards; Hospital-non-covid ward; Outpatient or ER; Other care facilities. RESULTS 1170 nurses participated, about 1/3 of them tested positive for COVID-19 by November 2021, mostly developing mild disease. Almost 2/3 reported long-covid symptoms and about 13% reported that they do not plan to get vaccinated against COVID-19. The median of the score of the impact of workload on health was 2.8 (56% of the maximum 5), the median score of mental health-wellbeing was 1.9 (63% of a maximum of 3). The studied impacts in all domains were highest in nurses working in COVID-19 hospital wards. Significant disruptions of health care were reported, with relatively high use of telemedicine to mitigate them. Overall, about 70% of the respondents thought of leaving their job, mostly due to working stress or inadequate pay. CONCLUSIONS Our study showed that the COVID-19 pandemic poses a substantial burden on the health, wellbeing and working conditions of nurses in Slovakia and that a large proportion of nurses considered leaving their jobs because of work overload or low salaries. Human resource strategies should be adopted to attract, retain and continuously invest in HW development including in emergency preparedness and response. Such an approach may improve the resilience and preparedness of the health system in Slovakia for future emergencies.
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Affiliation(s)
- Silvia Putekova
- Faculty of Health Sciences and Social Work, Department of Nursing, Trnava University, Trnava, Slovakia
| | - Jana Martinkova
- Faculty of Health Sciences and Social Work, Department of Nursing, Trnava University, Trnava, Slovakia
| | - Alena Urickova
- Faculty of Health Sciences and Social Work, Department of Nursing, Trnava University, Trnava, Slovakia
| | - Lukas Kober
- Faculty of Health, Department of Nursing, Catholic University, Ruzomberok, Slovakia
- Slovak Chamber of Nurses and Midwives, Bratislava, Slovakia
| | - Stanislava Reichertova
- Department of Paramedic Science, Medical Diagnostic Studies and Public Health, Faculty of Health Care Studies, University of West Bohemia, Pilsen, Czech Republic
| | - Dominika Plancikova
- Institute for Global Health and Epidemiology, Department of Public Health, Faculty of Health Sciences and Social Work, Trnava University, Hornopotocna 23, 91843, Trnava, Slovakia
| | - Marek Majdan
- Institute for Global Health and Epidemiology, Department of Public Health, Faculty of Health Sciences and Social Work, Trnava University, Hornopotocna 23, 91843, Trnava, Slovakia.
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9
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Gallian P, Hozé N, Brisbarre N, Saba Villarroel PM, Nurtop E, Isnard C, Pastorino B, Richard P, Morel P, Cauchemez S, de Lamballerie X. SARS-CoV-2 IgG seroprevalence surveys in blood donors before the vaccination campaign, France 2020-2021. iScience 2023; 26:106222. [PMID: 36818722 PMCID: PMC9930380 DOI: 10.1016/j.isci.2023.106222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 12/20/2022] [Accepted: 02/11/2023] [Indexed: 02/17/2023] Open
Abstract
We conducted a cross-sectional study for SARS-CoV-2 anti-S1 IgG prevalence in French blood donors (n = 32605), from March-2020 to January-2021. A mathematical model combined seroprevalence with a daily number of hospital admissions to estimate the probability of hospitalization upon infection and determine the number of infections while correcting for antibody decay. There was an overall seroprevalence increase over the study period and we estimate that ∼15% of the French population had been infected by SARS-CoV-2 by January-2021. The infection/hospitalization ratio increased with age, from 0.31% (18-30yo) to 4.5% (61-70yo). Half of the IgG-S1 positive individuals had no detectable antibodies 4 to 5 months after infection. The seroprevalence in group O donors (7.43%) was lower (p = 0.003) than in A, B, and AB donors (8.90%). We conclude, based on seroprevalence data and mathematical modeling, that a large proportion of the French population was unprotected against severe disease prior to the vaccination campaign.
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Affiliation(s)
- Pierre Gallian
- Établissement Français du Sang, La Plaine Saint Denis 93218, France.,Unité des Virus Émergents (UVE: Aix-Marseille University - IRD 190 - Inserm 1207), 13005 Marseille, France
| | - Nathanaël Hozé
- Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, Université Paris Cité, UMR2000, CNRS, 75015 Paris, France
| | - Nadège Brisbarre
- Unité des Virus Émergents (UVE: Aix-Marseille University - IRD 190 - Inserm 1207), 13005 Marseille, France.,Établissement Français du Sang Provence Alpes Côte d'Azur et Corse, 13005 Marseille France
| | | | - Elif Nurtop
- Unité des Virus Émergents (UVE: Aix-Marseille University - IRD 190 - Inserm 1207), 13005 Marseille, France
| | - Christine Isnard
- Unité des Virus Émergents (UVE: Aix-Marseille University - IRD 190 - Inserm 1207), 13005 Marseille, France.,Établissement Français du Sang Provence Alpes Côte d'Azur et Corse, 13005 Marseille France
| | - Boris Pastorino
- Unité des Virus Émergents (UVE: Aix-Marseille University - IRD 190 - Inserm 1207), 13005 Marseille, France
| | - Pascale Richard
- Établissement Français du Sang, La Plaine Saint Denis 93218, France
| | - Pascal Morel
- Établissement Français du Sang, La Plaine Saint Denis 93218, France.,UMR RIGHT 1098, Inserm, Établissement Français du Sang, University of Franche-Comté, 25000 Besançon, France
| | - Simon Cauchemez
- Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, Université Paris Cité, UMR2000, CNRS, 75015 Paris, France
| | - Xavier de Lamballerie
- Unité des Virus Émergents (UVE: Aix-Marseille University - IRD 190 - Inserm 1207), 13005 Marseille, France
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10
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Metzger C, Leroy T, Bochnakian A, Jeulin H, Gegout-Petit A, Legrand K, Schvoerer E, Guillemin F. Seroprevalence and SARS-CoV-2 invasion in general populations: A scoping review over the first year of the pandemic. PLoS One 2023; 18:e0269104. [PMID: 37075077 PMCID: PMC10118383 DOI: 10.1371/journal.pone.0269104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 05/13/2022] [Indexed: 04/20/2023] Open
Abstract
Since the beginning of the COVID-19 pandemic, counting infected people has underestimated asymptomatic cases. This literature scoping review assessed the seroprevalence progression in general populations worldwide over the first year of the pandemic. Seroprevalence studies were searched in PubMed, Web of Science and medRxiv databases up to early April 2021. Inclusion criteria were a general population of all ages or blood donors as a proxy. All articles were screened for the title and abstract by two readers, and data were extracted from selected articles. Discrepancies were resolved with a third reader. From 139 articles (including 6 reviews), the seroprevalence estimated in 41 countries ranged from 0 to 69%, with a heterogenous increase over time and continents, unevenly distributed among countries (differences up to 69%) and sometimes among regions within a country (up to 10%). The seroprevalence of asymptomatic cases ranged from 0% to 31.5%. Seropositivity risk factors included low income, low education, low smoking frequency, deprived area residency, high number of children, densely populated centres, and presence of a case in a household. This review of seroprevalence studies over the first year of the pandemic documented the progression of this virus across the world in time and space and the risk factors that influenced its spread.
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Affiliation(s)
- Clémentine Metzger
- CHRU -Nancy, INSERM, Université de Lorraine, CIC Epidémiologie clinique,
F-54000, Nancy, France
| | - Taylor Leroy
- CHRU -Nancy, INSERM, Université de Lorraine, CIC Epidémiologie clinique,
F-54000, Nancy, France
| | - Agathe Bochnakian
- CHRU -Nancy, INSERM, Université de Lorraine, CIC Epidémiologie clinique,
F-54000, Nancy, France
| | - Hélène Jeulin
- Université de Lorraine, CNRS, LCPME, F‐54000, Nancy,
France
- Laboratoire de Virologie, CHRU de Nancy Brabois, F‐54500, Nancy,
France
| | | | - Karine Legrand
- CHRU -Nancy, INSERM, Université de Lorraine, CIC Epidémiologie clinique,
F-54000, Nancy, France
| | - Evelyne Schvoerer
- Université de Lorraine, CNRS, LCPME, F‐54000, Nancy,
France
- Laboratoire de Virologie, CHRU de Nancy Brabois, F‐54500, Nancy,
France
| | - Francis Guillemin
- CHRU -Nancy, INSERM, Université de Lorraine, CIC Epidémiologie clinique,
F-54000, Nancy, France
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11
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Thon V, Piler P, Pavlík T, Andrýsková L, Doležel K, Kostka D, Pikhart H, Bobák M, Klánová J. Investigation of SARS-CoV-2 seroprevalence in relation to natural infection and vaccination between October 2020 and September 2021 in the Czech Republic: a prospective national cohort study. BMJ Open 2023; 13:e068258. [PMID: 36898746 PMCID: PMC10008433 DOI: 10.1136/bmjopen-2022-068258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/12/2023] Open
Abstract
OBJECTIVE Examine changes in SARS-CoV-2 seropositivity before and during the national vaccination campaign in the Czech Republic. DESIGN Prospective national population-based cohort study. SETTING Masaryk University, RECETOX, Brno. PARTICIPANTS 22 130 persons provided blood samples at two time points approximately 5-7 months apart, between October 2020 and March 2021 (phase I, before vaccination), and between April and September 2021 (during vaccination campaign). OUTCOME MEASURES Antigen-specific humoral immune response was analysed by detection of IgG antibodies against the SARS-CoV-2 spike protein by commercial chemiluminescent immunoassays. Participants completed a questionnaire that included personal information, anthropometric data, self-reported results of previous RT-PCR tests (if performed), history of symptoms compatible with COVID-19 and records of COVID-19 vaccination. Seroprevalence was compared between calendar periods, previous RT-PCR results, vaccination and other individual characteristics. RESULTS Before vaccination (phase I), seroprevalence increased from 15% in October 2020 to 56% in March 2021. By the end of phase II, in September 2021, prevalence increased to 91%; the highest seroprevalence was seen among vaccinated persons with and without previous SARS-CoV-2 infection (99.7% and 97.2%, respectively), while the lowest seroprevalence was found among unvaccinated persons with no signs of disease (26%). Vaccination rates were lower in persons who were seropositive in phase I but increased with age and body mass index. Only 9% of unvaccinated subjects who were seropositive in phase I became seronegative by phase II. CONCLUSIONS The rapid increase in seropositivity during the second wave of the COVID-19 epidemic (covered by phase I of this study) was followed by a similarly steep rise in seroprevalence during the national vaccination campaign, reaching seropositivity rates of over 97% among vaccinated persons.
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Affiliation(s)
- Vojtěch Thon
- RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Pavel Piler
- RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Tomáš Pavlík
- Institute of Biostatistics and Analyses, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Lenka Andrýsková
- RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic
| | | | - David Kostka
- Health Insurance Company of the Ministry of the Interior of the Czech Republic, Prague, Czech Republic
| | - Hynek Pikhart
- RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic
- Department of Epidemiology and Public Health, University College London, London WC1E 6BT, UK
| | - Martin Bobák
- RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic
- Department of Epidemiology and Public Health, University College London, London WC1E 6BT, UK
| | - Jana Klánová
- RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic
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12
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O’Brien SF, Caffrey N, Yi QL, Bolotin S, Janjua NZ, Binka M, Thanh CQ, Stein DR, Lang A, Colquhoun A, Pambrun C, Reedman CN, Drews SJ. Cross-Canada Variability in Blood Donor SARS-CoV-2 Seroprevalence by Social Determinants of Health. Microbiol Spectr 2023; 11:e0335622. [PMID: 36625634 PMCID: PMC9927354 DOI: 10.1128/spectrum.03356-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 12/07/2022] [Indexed: 01/11/2023] Open
Abstract
We compared the seroprevalence of SARS-CoV-2 anti-nucleocapsid antibodies in blood donors across Canadian regions in 2021. The seroprevalence was the highest in Alberta and the Prairies, and it was so low in Atlantic Canada that few correlates were observed. Being male and of young age were predictive of seropositivity. Racialization was associated with higher seroprevalence in British Columbia and Ontario but not in Alberta and the Prairies. Living in a materially deprived neighborhood predicted higher seroprevalence, but it was more linear across quintiles in Alberta and the Prairies, whereas in British Columbia and Ontario, the most affluent 60% were similarly low and the most deprived 40% similarly elevated. Living in a more socially deprived neighborhood (more single individuals and one parent families) was associated with lower seroprevalence in British Columbia and Ontario but not in Alberta and the Prairies. These data show striking variability in SARS-CoV-2 seroprevalence across regions by social determinants of health. IMPORTANCE Canadian blood donors are a healthy adult population that shows clear disparities associated with racialization and material deprivation. This underscores the pervasiveness of the socioeconomic gradient on SARS-CoV-2 infections in Canada. We identify regional differences in the relationship between SARS-CoV-2 seroprevalence and social determinants of health. Cross-Canada studies, such as ours, are rare because health information is under provincial jurisdiction and is not available in sufficient detail in national data sets, whereas other national seroprevalence studies have insufficient sample sizes for regional comparisons. Ours is the largest seroprevalence study in Canada. An important strength of our study is the interpretation input from a public health team that represented multiple Canadian provinces. Our blood donor seroprevalence study has informed Canadian public health policy at national and provincial levels since the start of the SARS-CoV-2 pandemic.
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Affiliation(s)
- Sheila F. O’Brien
- Epidemiology and Surveillance, Canadian Blood Services, Ottawa, Ontario, Canada
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, Ontario, Canada
| | - Niamh Caffrey
- Epidemiology and Surveillance, Canadian Blood Services, Ottawa, Ontario, Canada
| | - Qi-Long Yi
- Epidemiology and Surveillance, Canadian Blood Services, Ottawa, Ontario, Canada
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, Ontario, Canada
| | - Shelly Bolotin
- Center for Vaccine Preventable Disease, University of Toronto, Toronto, Ontario, Canada
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Public Health Ontario, Toronto, Ontario, Canada
| | - Naveed Z. Janjua
- BC Centre for Disease Control, British Columbia, Vancouver, Canada
- School of Population and Public Health, University of British Columbia, British Columbia, Vancouver, Canada
| | - Mawuena Binka
- BC Centre for Disease Control, British Columbia, Vancouver, Canada
| | - Caroline Quach Thanh
- Department of Microbiology, Infectious Diseases & Immunology, Faculty of Medicine, University of Montreal, Montreal, Quebec, Canada
- Infection Prevention & Control, Clinical Department of Laboratory Medicine, CHU Sainte-Justine, Montreal, Quebec, Canada
| | - Derek R. Stein
- Cadham Provincial Laboratory, Winnipeg, Manitoba, Canada
- Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Amanda Lang
- Roy Romanow Provincial laboratory, Saskatchewan Health Authority, Regina, Saskatchewan, Canada
| | - Amy Colquhoun
- Population Health Assessment, Alberta Health, Edmonton, Alberta, Canada
- School of Public Health, University of Alberta, Edmonton, Alberta, Canada
| | - Chantale Pambrun
- Medical Affairs & Innovation, Canadian Blood Services, Ottawa, Ontario, Canada
- Department of Pathology & Laboratory Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Cassandra N. Reedman
- Epidemiology and Surveillance, Canadian Blood Services, Ottawa, Ontario, Canada
- Public Health Agency of Canada, Ottawa, Ontario, Canada
| | - Steven J. Drews
- Medical Microbiology Department, Canadian Blood Services, Edmonton, Alberta, Canada
- Department of Laboratory Medicine & Pathology, Division of Diagnostic and Applied Microbiology, University of Alberta, Edmonton, Alberta, Canada
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13
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Núñez-Franz L, Ramírez-Santana M, Rubilar P, Vial C, Apablaza M, González C, Said M, Olivares K, Cortés LJ, Hormazábal J, Canales L, Vial P, Icaza G, Quezada-Gaete R, Aguilera X. Seroprevalence of Natural and Acquired Immunity against the SARS-CoV-2 Virus in a Population Cohort from Two Chilean Cities, 2020-2022. Viruses 2023; 15:201. [PMID: 36680241 PMCID: PMC9861850 DOI: 10.3390/v15010201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/04/2023] [Accepted: 01/06/2023] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Chile has achieved the highest coverage for vaccines against the SARS-CoV-2 virus worldwide. OBJECTIVE To assess the progression of immunity (natural and acquired by vaccine) in a cohort from two Chilean cities. METHODS Individuals (n = 386) who participated in three phases of population-based serial prevalence studies were included (2020-2021 and 2022). Presence of SARS-CoV-2 antibodies was measured in serum. Data including time of vaccination and type of vaccine received were analysed with descriptive statistics. RESULTS Seroprevalence was 3.6% in the first round and increased to 96.9% in the second and 98.7% in the third. In the third round, 75% of individuals who had received the basal full scheme were seropositive at 180 days or more since their last dose; 98% of individuals who received one booster dose were seropositive at 180 days or more, and 100% participants who received two boosters were seropositive, regardless of time since their last dose. Participants receiving mRNA vaccines had higher seroprevalence rates over time. CONCLUSIONS The high vaccination coverage in Chile enabled the population to maintain high levels of antibodies. Vaccination boosters are essential to maintain immunity over time, which also depends on the type of vaccine administered.
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Affiliation(s)
- Loreto Núñez-Franz
- Departamento de Salud Pública, Facultad de Ciencias de la Salud, Universidad de Talca, Talca 3460000, Chile
| | - Muriel Ramírez-Santana
- Public Health Department, Faculty of Medicine, Universidad Católica del Norte, Coquimbo 1780000, Chile
| | - Paola Rubilar
- Centro de Epidemiología y Políticas de Salud, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Santiago 7550000, Chile
| | - Cecilia Vial
- Instituto de Ciencias e Innovación en Medicina, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Santiago 8320000, Chile
| | - Mauricio Apablaza
- Facultad de Gobierno, Universidad del Desarrollo, Santiago 7550000, Chile
| | - Claudia González
- Centro de Epidemiología y Políticas de Salud, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Santiago 7550000, Chile
| | - Macarena Said
- Departamento de Salud Pública, Facultad de Ciencias de la Salud, Universidad de Talca, Talca 3460000, Chile
| | - Kathya Olivares
- Public Health Department, Faculty of Medicine, Universidad Católica del Norte, Coquimbo 1780000, Chile
| | - Lina Jimena Cortés
- Instituto de Ciencias e Innovación en Medicina, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Santiago 8320000, Chile
| | - Juan Hormazábal
- Instituto de Ciencias e Innovación en Medicina, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Santiago 8320000, Chile
| | - Luis Canales
- Facultad de Economía y Negocios, Universidad de Talca, Talca 3460000, Chile
| | - Pablo Vial
- Instituto de Ciencias e Innovación en Medicina, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Santiago 8320000, Chile
| | - Gloria Icaza
- Facultad de Economía y Negocios, Universidad de Talca, Talca 3460000, Chile
| | - Rubén Quezada-Gaete
- Public Health Department, Faculty of Medicine, Universidad Católica del Norte, Coquimbo 1780000, Chile
| | - Ximena Aguilera
- Centro de Epidemiología y Políticas de Salud, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Santiago 7550000, Chile
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14
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O’Brien SF, Goldman M, Drews SJ. An expanded role for blood donor emerging pathogens surveillance. CMAJ 2023; 195:E16. [PMID: 36623858 PMCID: PMC9829065 DOI: 10.1503/cmaj.147635-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Affiliation(s)
| | - Mindy Goldman
- Medical director, Donation Policy and Studies, Canadian Blood Services, Ottawa, Ont
| | - Steven J Drews
- Associate director, Microbiology, Donation Policy and Studies, Canadian Blood Services, Edmonton, Alta
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15
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Strengers P, O'Brien SF, Politis C, Mayr W, Seifried E, Spencer BR. White paper on pandemic preparedness in the blood supply. Vox Sang 2023; 118:8-15. [PMID: 36427057 DOI: 10.1111/vox.13378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 09/30/2022] [Accepted: 10/28/2022] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND OBJECTIVES In March 2020, the WHO declared the SARS-CoV-2 corona virus a pandemic which caused a great disruption to global society and had a pronounced effect on the worldwide supply of blood. MATERIALS AND METHODS In 2022 an on-line meeting was organised with experts from Austria, Canada, Germany, Greece, Netherlands and United States to explore the opportunities for increasing preparedness within blood systems for a potential future pandemic with similar, or more devastating, consequences. The main themes included the value of preparedness, current risks to the blood supply, supply chain vulnerabilities, and the role of innovation in increasing resiliency and safety. RESULTS Seven key recommendations were formulated and including required actions at different levels. CONCLUSION Although SARS-CoV-2 might be seen as a unique event, global health risks are expected to increase and will affect blood transfusion medicine if no preparedness plans are developed.
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Affiliation(s)
| | | | - Constantina Politis
- Department of Medicine, Athens University, Athens, Greece.,National Public Health Organization, Athens, Greece
| | - Wolfgang Mayr
- Medical University of Vienna, Vienna, Austria.,Austrian Red Cross Blood Transfusion Service, Vienna, Austria.,European Blood Alliance, Amsterdam, Netherlands
| | - Erhard Seifried
- European Blood Alliance, Amsterdam, Netherlands.,DRK Blutspendedienst, Frankfurt, Germany
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16
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Chen GJ, Palmer JR, Bartumeus F, Alba-Casals A. Modeling the impact of surveillance activities combined with physical distancing interventions on COVID-19 epidemics at a local level. Infect Dis Model 2022; 7:811-822. [PMID: 36411772 PMCID: PMC9670679 DOI: 10.1016/j.idm.2022.11.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 10/26/2022] [Accepted: 11/03/2022] [Indexed: 11/18/2022] Open
Abstract
Physical distancing and contact tracing are two key components in controlling the COVID-19 epidemics. Understanding their interaction at local level is important for policymakers. We propose a flexible modeling framework to assess the effect of combining contact tracing with different physical distancing strategies. Using scenario tree analyses, we compute the probability of COVID-19 detection using passive surveillance, with and without contact tracing, in metropolitan Barcelona. The estimates of detection probability and the frequency of daily social contacts are fitted into an age-structured susceptible-exposed-infectious-recovered compartmental model to simulate the epidemics considering different physical distancing scenarios over a period of 26 weeks. With the original Wuhan strain, the probability of detecting an infected individual without implementing physical distancing would have been 0.465, 0.515, 0.617, and 0.665 in designated age groups (0-14, 15-49, 50-64, and >65), respectively. As the physical distancing measures were reinforced and the disease circulation decreased, the interaction between the two interventions resulted in a reduction of the detection probabilities; however, despite this reduction, active contact tracing and isolation remained an effective supplement to physical distancing. If we relied solely on passive surveillance for diagnosing COVID-19, the model required a minimal 50% (95% credible interval, 39-69%) reduction of daily social contacts to keep the infected population under 5%, as compared to the 36% (95% credible interval, 22-56%) reduction with contact tracing systems. The simulation with the B.1.1.7 and B.1.167.2 strains shows similar results. Our simulations showed that a functioning contact tracing program would reduce the need for physical distancing and mitigate the COVID-19 epidemics.
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Affiliation(s)
- Guan-Jhou Chen
- College of Medicine, National Taiwan University, Taipei, Taiwan
- Min-Sheng General Hospital, Taoyuan, Taiwan
| | - John R.B. Palmer
- Department of Political and Social Sciences, Universitat Pompeu Fabra, Barcelona, Spain
| | - Frederic Bartumeus
- Centre d’Estudis Avançats de Blanes (CEAB-CSIC), Blanes, 17300, Spain
- Centre de Recerca Ecològica i Aplicacions Forestals (CREAF), Cerdanyola del Vallès, 08193, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, 08010, Spain
| | - Ana Alba-Casals
- Centre de Recerca en Sanitat Animal (CReSA), Institut de Recerca i Tecnologia Agroalimentàries, Spain
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17
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SARS-CoV-2 Seroprevalence among Canadian Blood Donors: The Advance of Omicron. Viruses 2022; 14:v14112336. [PMID: 36366432 PMCID: PMC9695729 DOI: 10.3390/v14112336] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/13/2022] [Accepted: 10/17/2022] [Indexed: 02/01/2023] Open
Abstract
With the emergence of the SARS-CoV-2 Omicron variant in late 2021, Canadian public health case/contact testing was scaled back due to high infection rates with milder symptoms in a highly vaccinated population. We monitored the seroprevalence of SARS-CoV-2 nucleocapsid (anti-N) and spike protein (anti-S) antibodies in blood donors across Canada from September 2021 to June 2022 in 202,123 randomly selected samples. Multivariable logistic regression of anti-N positivity with month, age, sex, racialization, region, material and social deprivation (based on postal code) identified as independent predictors. Piece-wise logistic regression analysed the association between anti-S concentration and month, and anti-N/anti-S positivity. Infection-related seroprevalence (anti-N positive) was 4.38% (95% CI: 3.96, 4.81) in September reaching 50.70% (50.15, 52.16) in June; nearly 100% were anti-S positive throughout. Anti-N positivity was associated with younger age, male sex, the Alberta and Prairies regions, greater material deprivation and less social deprivation (p < 0.001). Anti-S concentration was high initially (3306 U/mL, IQR 4280 U/mL), increased to (13,659 U/mL, IQR 28,224 U/mL) by June (p < 0.001), following the pattern of deployment of the third and fourth vaccine doses and was higher in those that were anti-N positive (p < 0.001). Despite already high vaccination-related seroprevalence, infection-related seroprevalence increased dramatically with the emergence of the Omicron SARS-CoV-2 variant.
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18
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Moe AMG, Eriksen MB, Schjølberg T, Haugen F. SARS-CoV-2 serological findings and exposure risk among employees in school and retail after first and second wave COVID-19 pandemic in Oslo, Norway: a cohort study. Int J Occup Med Environ Health 2022; 35:537-547. [PMID: 35770786 PMCID: PMC10464784 DOI: 10.13075/ijomeh.1896.01942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 02/16/2022] [Indexed: 10/17/2022] Open
Abstract
OBJECTIVES The objective was to characterize and compare SARS-CoV-2 serology among Norwegian school employees and retail employees, and describe preventive measures taken at the workplaces. MATERIAL AND METHODS A cohort of 238 school and retail employees was enrolled to an ambidirectional cohort study after the first COVID-19 pandemic wave. Self-reported exposure history and serum samples were collected at 10 schools and 15 retail stores in Oslo, Norway, sampled at 2 time-points: baseline (May-July 2020); and follow-up (January-March 2021). SARS-CoV-2 antibodies targeting both spike and nucleocapsid were detected by multiplex microsphere-based serological methods. RESULTS At baseline, 6 enrolled workers (5 in retail) presented with positive SARS-CoV-2 serology, higher than the expected 1% prevalence (3%, 95% CI: 1-6, p = 0.019). At followup, school and retail groups presented 11 new seropositive cases altogether, but groups were not significantly different, although exposure and preventive measures against viral transmission at workplaces were different between groups. Self-reported medical history of COVID-19 infection showed that all but one positive SARS-CoV-2 serological findings arising between baseline and follow-up had been diagnosed with virus testing. CONCLUSIONS Distribution of SARS-CoV-2 positive serology after the first wave was slightly higher than expected. Distribution of infection was not significantly different between the groups at baseline nor at follow-up, despite difference in exposure and protective measures. Nearly all new seropositive cases discovered between baseline and follow-up, had already been diagnosed, highlighting the importance of extensive viral testing among workers. Int J Occup Med Environ Health. 2022;35(5):537-47.
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Affiliation(s)
| | | | | | - Fred Haugen
- National Institute of Occupational Health STAMI, Oslo, Norway
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19
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Willeit P, Kimpel J, Winner H, Harthaller T, Schäfer H, Bante D, Falkensammer B, Rössler A, Riepler L, Ower C, Sacher M, von Laer D, Borena W. Seroprevalence of SARS-CoV-2 infection in the Tyrolean district of Schwaz at the time of the rapid mass vaccination in March 2021 following B.1.351-variant outbreak. Front Public Health 2022; 10:989337. [PMID: 36159252 PMCID: PMC9500479 DOI: 10.3389/fpubh.2022.989337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 08/17/2022] [Indexed: 01/26/2023] Open
Abstract
In order to curb the rapid dissemination of the B.1.351 variant of SARS-CoV-2 in the district of Schwaz and beyond, the EU allocated additional vaccine doses at the beginning of March 2021 to implement a rapid mass vaccination of the population (16+). The aim of our study was to determine the seroprevalence of SARS-CoV-2 among the adult population in the district of Schwaz at the time of the implementation. Data on previous history of infections, symptoms and immunization status were collected using a structured questionnaire. Blood samples were used to determine SARS-CoV-2 specific anti-spike, anti-nucleocapsid and neutralizing antibodies. We recruited 2,474 individuals with a median age (IQR) of 42 (31-54) years. Using the official data on distribution of age and sex, we found a standardized prevalence of undocumented infections at 15.0% (95% CI: 13.2-16.7). Taken together with the officially documented infections, we estimated that 24.0% (95% CI: 22.5-25.6) of the adult population had prior SARS-CoV-2 infection. Hence, the proportion of undocumented infections identified by our study was 55.8% (95% CI: 52.7-58.5). With a vaccination coverage of 10% among the adults population at that time, we imply that a minimum of two-thirds of the target popuation was susceptible to the circulating threat when this unique campaign started.
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Affiliation(s)
- Peter Willeit
- Clinical Epidemiology Team, Medical University of Innsbruck, Innsbruck, Austria,Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom
| | - Janine Kimpel
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria
| | - Hannes Winner
- Department of Economics, University of Salzburg, Salzburg, Austria
| | - Teresa Harthaller
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria
| | - Helena Schäfer
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria
| | - David Bante
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria
| | - Barbara Falkensammer
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria
| | - Annika Rössler
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria
| | - Lydia Riepler
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria
| | - Cornelia Ower
- Department of Surgery, University Hospital of Trauma Surgery, Medical University of Innsbruck, Innsbruck, Austria
| | - Magdalena Sacher
- Department of Visceral, Transplant and Thoracic Surgery, Center of Operative Medicine, Medical University of Innsbruck, Innsbruck, Austria
| | - Dorothee von Laer
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria
| | - Wegene Borena
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria,*Correspondence: Wegene Borena
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20
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Schwalb A, Armyra E, Méndez-Aranda M, Ugarte-Gil C. COVID-19 in Latin America and the Caribbean: Two years of the pandemic. J Intern Med 2022; 292:409-427. [PMID: 35411985 PMCID: PMC9115176 DOI: 10.1111/joim.13499] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Worldwide, nations have struggled during the coronavirus disease 2019 (COVID-19) pandemic. However, Latin America and the Caribbean faced an unmatched catastrophic toll. As of March 2022, the region has reported approximately 15% of cases and 28% of deaths worldwide. Considering the relatively late arrival of SARS-CoV-2, several factors in the region were determinants of the humanitarian crisis that ensued. Pandemic unpreparedness, fragile healthcare systems, forthright inequalities, and poor governmental support facilitated the spread of the virus throughout the region. Moreover, reliance on repurposed and ineffective drugs such as hydroxychloroquine and ivermectin-to treat or prevent COVID-19-was publicised through misinformation and created a false sense of security and poor adherence to social distancing measures. While there were hopes that herd immunity could be achieved after the region's disastrous first peak, the emergence of the Gamma, Lambda, and Mu variants made this unattainable. This review explores how Latin America and the Caribbean fared during the first 2 years of the pandemic, and how, despite all the challenges, the region became a global leader in COVID-19 vaccination, with 63% of its population fully vaccinated.
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Affiliation(s)
- Alvaro Schwalb
- Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Lima, Peru.,London School of Hygiene and Tropical Medicine, London, UK
| | - Eleonora Armyra
- Health Innovation Lab, Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Melissa Méndez-Aranda
- Facultad de Ciencias y Filosofía, Laboratorio de Investigación en Enfermedades Infecciosas, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - César Ugarte-Gil
- Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Lima, Peru.,London School of Hygiene and Tropical Medicine, London, UK.,School of Medicine, Universidad Peruana Cayetano Heredia, Lima, Peru
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21
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Mucaki EJ, Shirley BC, Rogan PK. Likely community transmission of COVID-19 infections between neighboring, persistent hotspots in Ontario, Canada. F1000Res 2022; 10:1312. [PMID: 35646330 PMCID: PMC9130760 DOI: 10.12688/f1000research.75891.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/19/2022] [Indexed: 11/20/2022] Open
Abstract
Introduction: This study aimed to produce community-level geo-spatial mapping of confirmed COVID-19 cases in Ontario Canada in near real-time to support decision-making. This was accomplished by area-to-area geostatistical analysis, space-time integration, and spatial interpolation of COVID-19 positive individuals. Methods: COVID-19 cases and locations were curated for geostatistical analyses from March 2020 through June 2021, corresponding to the first, second, and third waves of infections. Daily cases were aggregated according to designated forward sortation area (FSA), and postal codes (PC) in municipal regions Hamilton, Kitchener/Waterloo, London, Ottawa, Toronto, and Windsor/Essex county. Hotspots were identified with area-to-area tests including Getis-Ord Gi*, Global Moran’s I spatial autocorrelation, and Local Moran’s I asymmetric clustering and outlier analyses. Case counts were also interpolated across geographic regions by Empirical Bayesian Kriging, which localizes high concentrations of COVID-19 positive tests, independent of FSA or PC boundaries. The
Geostatistical Disease Epidemiology Toolbox, which is freely-available software, automates the identification of these regions and produces digital maps for public health professionals to assist in pandemic management of contact tracing and distribution of other resources. Results: This study provided indicators in real-time of likely, community-level disease transmission through innovative geospatial analyses of COVID-19 incidence data. Municipal and provincial results were validated by comparisons with known outbreaks at long-term care and other high density residences and on farms. PC-level analyses revealed hotspots at higher geospatial resolution than public reports of FSAs, and often sooner. Results of different tests and kriging were compared to determine consistency among hotspot assignments. Concurrent or consecutive hotspots in close proximity suggested potential community transmission of COVID-19 from cluster and outlier analysis of neighboring PCs and by kriging. Results were also stratified by population based-categories (sex, age, and presence/absence of comorbidities). Conclusions: Earlier recognition of hotspots could reduce public health burdens of COVID-19 and expedite contact tracing.
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Affiliation(s)
- Eliseos J. Mucaki
- Department of Biochemistry, University of Western Ontario, London, Ontario, N6A 5C1, Canada
- CytoGnomix Inc, London, Ontario, N5X 3X5, Canada
| | | | - Peter K. Rogan
- Department of Biochemistry, University of Western Ontario, London, Ontario, N6A 5C1, Canada
- CytoGnomix Inc, London, Ontario, N5X 3X5, Canada
- Department of Oncology, University of Western Ontario, London, Ontario, N6A 5C1, Canada
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22
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Nourmohammadi H, Dehkordi AH, Adibi A, Amin Hashemipour SM, Abdan M, Fakhri M, Abdan Z, Sarokhani D. Seroprevalence of COVID-19 in Blood Donors: A Systematic Review and Meta-Analysis. Adv Virol 2022; 2022:9342680. [PMID: 35910542 PMCID: PMC9334089 DOI: 10.1155/2022/9342680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 05/20/2022] [Accepted: 05/26/2022] [Indexed: 11/17/2022] Open
Abstract
Introduction Determining the prevalence of SARS-CoV-2 in blood donors makes the control of virus circulation possible in healthy people and helps implement strategies to reduce virus transmission. The purpose of the study was to examine the seroprevalence of COVID-19 in blood donors using systematic review and meta-analysis. Materials and Methods The electronic databases PubMed, Scopus, Web of Science, and the Google Scholar search engine were searched using standard keywords up to 2022-04-26. The variance of each study was calculated according to the binomial distribution. Studies were combined according to the sample size and variance. Q Cochrane test and I2 index were used to examine the heterogeneity of the studies. Data analysis was performed in STATA 14 software, and the significance level of the tests was P < 0.05. Results In the 28 papers examined with 227894 samples, the seroprevalence of COVID-19 in blood donors was 10% (95% CI: 9%, 11%), estimated 5% (95% CI: 4%, 7%) among men and 6% (95% CI: 4%, 7%) among women. This rate in different blood groups was as follows: A 12% (95% CI: 10%-14%), B 12% (95% CI: 10%-15%), AB 9% (95% CI: 7%-12%), and O 13% (95% CI: 11%-16%). The seroprevalence of COVID-19 in blood donors in North America 10%, Europe 7%, Asia 23%, South America 5%, and Africa was 4%; Moreover, the seroprevalence of IgG antibodies was estimated to be 23% (95% CI: 18%-29%) and IgM 29% (95% CI: 9%-49%). Conclusion The highest prevalence of COVID-19 serum in women blood donors was among blood group O and Asia. The seroprevalence of IgG and IgM antibodies was high too.
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Affiliation(s)
| | - Ali Hasanpour Dehkordi
- Social Determinants of Health Research Center, School of Allied Medical Sciences, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Amir Adibi
- Department of Child and Adolescent Psychiatry, Ilam University of Medical Sciences, Ilam, Iran
| | | | - Mohsen Abdan
- Research Center for Environmental Determinants of Health, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Moloud Fakhri
- Traditional and Complementary Medicine Research Center, Addiction Institute, Mazandaran University of Medical Sciences, Sari, Iran
| | - Zahra Abdan
- Clinical Research Development Center, Imam Reza Hospital, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Diana Sarokhani
- Research Center for Environmental Determinants of Health, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
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23
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Machalek DA, Vette KM, Downes M, Carlin JB, Nicholson S, Hirani R, Irving DO, Gosbell IB, Gidding HF, Shilling H, Aung E, Macartney K, Kaldor JM. Serological testing of blood donors to characterise the impact of COVID-19 in Melbourne, Australia, 2020. PLoS One 2022; 17:e0265858. [PMID: 35793307 PMCID: PMC9258843 DOI: 10.1371/journal.pone.0265858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 06/21/2022] [Indexed: 11/25/2022] Open
Abstract
Rapidly identifying and isolating people with acute SARS-CoV-2 infection has been a core strategy to contain COVID-19 in Australia, but a proportion of infections go undetected. We estimated SARS-CoV-2 specific antibody prevalence (seroprevalence) among blood donors in metropolitan Melbourne following a COVID-19 outbreak in the city between June and September 2020. The aim was to determine the extent of infection spread and whether seroprevalence varied demographically in proportion to reported cases of infection. The design involved stratified sampling of residual specimens from blood donors (aged 20–69 years) in three postcode groups defined by low (<3 cases/1,000 population), medium (3–7 cases/1,000 population) and high (>7 cases/1,000 population) COVID-19 incidence based on case notification data. All specimens were tested using the Wantai SARS-CoV-2 total antibody assay. Seroprevalence was estimated with adjustment for test sensitivity and specificity for the Melbourne metropolitan blood donor and residential populations, using multilevel regression and poststratification. Overall, 4,799 specimens were collected between 23 November and 17 December 2020. Seroprevalence for blood donors was 0.87% (90% credible interval: 0.25–1.49%). The highest estimates, of 1.13% (0.25–2.15%) and 1.11% (0.28–1.95%), respectively, were observed among donors living in the lowest socioeconomic areas (Quintiles 1 and 2) and lowest at 0.69% (0.14–1.39%) among donors living in the highest socioeconomic areas (Quintile 5). When extrapolated to the Melbourne residential population, overall seroprevalence was 0.90% (0.26–1.51%), with estimates by demography groups similar to those for the blood donors. The results suggest a lack of extensive community transmission and good COVID-19 case ascertainment based on routine testing during Victoria’s second epidemic wave. Residual blood donor samples provide a practical epidemiological tool for estimating seroprevalence and information on population patterns of infection, against which the effectiveness of ongoing responses to the pandemic can be assessed.
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Affiliation(s)
- Dorothy A. Machalek
- The Kirby Institute, University of New South Wales, Sydney, Australia
- Centre for Women’s Infectious Diseases, The Royal Women’s Hospital, Melbourne, Australia
- * E-mail:
| | - Kaitlyn M. Vette
- National Centre for Immunisation Research and Surveillance, Sydney, Australia
| | - Marnie Downes
- Murdoch Children’s Research Institute, Melbourne, Australia
| | - John B. Carlin
- Murdoch Children’s Research Institute, Melbourne, Australia
- Department of Paediatrics and School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Suellen Nicholson
- Victorian Infectious Diseases Reference Laboratory, The Royal Melbourne Hospital, The Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Rena Hirani
- Clinical Services and Research, Australian Red Cross Lifeblood, Sydney, Australia
- Department of Molecular Sciences, Macquarie University, Sydney, Australia
| | - David O. Irving
- Clinical Services and Research, Australian Red Cross Lifeblood, Sydney, Australia
- Faculty of Health, University of Technology Sydney, Sydney, Australia
| | - Iain B. Gosbell
- Clinical Services and Research, Australian Red Cross Lifeblood, Sydney, Australia
- School of Medicine, Western Sydney University, Sydney, Australia
| | - Heather F. Gidding
- National Centre for Immunisation Research and Surveillance, Sydney, Australia
- Faculty of Medicine and Health, The University of Sydney Northern Clinical School, Sydney, Australia
- Women and Babies Research, Kolling Institute, Northern Sydney Local Health District, Sydney, Australia
| | - Hannah Shilling
- Centre for Women’s Infectious Diseases, The Royal Women’s Hospital, Melbourne, Australia
- Murdoch Children’s Research Institute, Melbourne, Australia
| | - Eithandee Aung
- The Kirby Institute, University of New South Wales, Sydney, Australia
- Centre for Women’s Infectious Diseases, The Royal Women’s Hospital, Melbourne, Australia
| | - Kristine Macartney
- National Centre for Immunisation Research and Surveillance, Sydney, Australia
- School of Medicine, Western Sydney University, Sydney, Australia
| | - John M. Kaldor
- The Kirby Institute, University of New South Wales, Sydney, Australia
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24
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Goh FT, Chew YZ, Tam CC, Yung CF, Clapham H. A country-specific model of COVID-19 vaccination coverage needed for herd immunity in adult only or population wide vaccination programme. Epidemics 2022; 39:100581. [PMID: 35636311 PMCID: PMC9119722 DOI: 10.1016/j.epidem.2022.100581] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 01/06/2022] [Accepted: 05/16/2022] [Indexed: 01/31/2023] Open
Abstract
We present a country specific method to calculate the COVID-19 vaccination coverage needed for herd immunity by considering age structure, age group-specific contact patterns, relative infectivity and susceptibility of children to adults, vaccination effectiveness and seroprevalence prior to vaccination. We find that across all six countries, vaccination of adults age 60 and above has little impact on Reff and this is could be due to the smaller number of contacts between this age group and the rest of the population according to the contact matrices used. If R0 is above 6, herd immunity by vaccine alone is unattainable for most countries either if vaccination is only available for adults or that vaccine effectiveness is lower at 65% against symptomatic infections. In this situation, additional control measures, booster shots, if they improve protection against infection, or the extension of vaccination to children, are required. For a highly transmissible variant with R0 up to 8, herd immunity is possible for all countries and for all four scenarios of varying relative infectivity and susceptibility of children compared to adults, if vaccine effectiveness is very high at 95% against symptomatic infections and that high vaccination coverage is achieved for both adults and children. In addition, we show that the effective reproduction number will vary between countries even if the same proportion of the population is vaccinated, depending on the demographics, the contact rates and the previous pre-vaccination seroprevalence in the country. This therefore means that care must be taken in extrapolating population level impacts of certain vaccine coverages from one country to another.
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Affiliation(s)
- Fang Ting Goh
- Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
| | - Yi Zhen Chew
- Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
| | - Clarence C. Tam
- Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore,London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Chee Fu Yung
- Infectious Disease Service, KK Women’s and Children’s Hospital, Singapore,Duke-NUS Medical School, Singapore, Singapore,Lee Kong Chian School of Medicine, Imperial College, Nanyang Technological University, Singapore
| | - Hannah Clapham
- Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore,Correspondence to: Saw Swee Hock School of Public Health, Tahir Foundation Building (MD1), 12 Science Drive 2, #10-01, Singapore 117549, Singapore
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25
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Goldfarb DM, Mâsse LC, Watts AW, Hutchison SM, Muttucomaroe L, Bosman ES, Barakauskas VE, Choi A, Dhillon N, Irvine MA, Reicherz F, O'Reilly C, Sediqi S, Xu RY, Razzaghian HR, Sadarangani M, Coombs D, O'Brien SF, Lavoie PM. SARS-CoV-2 seroprevalence among Vancouver public school staff in British Columbia, Canada: a cross-sectional study. BMJ Open 2022; 12:e057846. [PMID: 35383082 PMCID: PMC8983418 DOI: 10.1136/bmjopen-2021-057846] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
OBJECTIVES Few studies reported COVID-19 cases in schools during the 2020/21 academic year in a setting of uninterrupted in-person schooling. The main objective was to determine the SARS-CoV-2 seroprevalence among school staff in Vancouver public schools. DESIGN Cumulative incident COVID-19 cases among all students and school staff based on public health data, with an embedded cross-sectional serosurvey among a school staff sample that was compared to period, age, sex and geographical location-weighted data from blood donors. SETTING Vancouver School District (British Columbia, Canada) from kindergarten to grade 12. PARTICIPANTS Active school staff enrolled from 3 February to 23 April 2021 with serology testing from 10 February to 15 May 2021. MAIN OUTCOME MEASURES SARS-CoV-2 seroprevalence among school staff, based on spike (S)-based (unvaccinated staff) or N-based serology testing (vaccinated staff). RESULTS Public health data showed the cumulative incidence of COVID-19 among students attending in-person was 9.8 per 1000 students (n=47 280), and 13 per 1000 among school staff (n=7071). In a representative sample of 1689 school staff, 78.2% had classroom responsibilities, and spent a median of 17.6 hours in class per week (IQR: 5.0-25 hours). Although 21.5% (363/1686) of surveyed staff self-reported close contact with a COVID-19 case outside of their household (16.5% contacts were school-based), 5 cases likely acquired the infection at school based on viral testing. Sensitivity/Specificity-adjusted seroprevalence in 1556/1689 staff (92.1%) was 2.3% (95% CI: 1.6% to 3.2%), comparable to a sex, age, date and residency area-weighted seroprevalence of 2.6% (95% CI: 2.2% to 3.1%) among 5417 blood donors. CONCLUSION Seroprevalence among staff was comparable to a reference group of blood donors from the same community. These data show that in-person schooling could be safely maintained during the 2020/21 school year with mitigation measures, in a large school district in Vancouver, Canada.
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Affiliation(s)
- David M Goldfarb
- Department of Pathology and Laboratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
| | - Louise C Mâsse
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada
| | - Allison W Watts
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Sarah M Hutchison
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Lauren Muttucomaroe
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Else S Bosman
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Vilte E Barakauskas
- Department of Pathology and Laboratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
| | - Alexandra Choi
- Office of the Medical Health Officer, Vancouver Coastal Health Authority, Vancouver, British Columbia, Canada
| | - Nalin Dhillon
- Office of the Medical Health Officer, Vancouver Coastal Health Authority, Vancouver, British Columbia, Canada
| | - Michael A Irvine
- British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada
- Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Frederic Reicherz
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
| | | | - Sadaf Sediqi
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
| | - Rui Yang Xu
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Hamid R Razzaghian
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Manish Sadarangani
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
- Vaccine Evaluation Center, British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
| | - Daniel Coombs
- Department of Mathematics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Sheila F O'Brien
- Epidemiology & Surveillance, Canadian Blood Services, Ottawa, Ontario, Canada
- School of Epidemiology & Public Health, University of Ottawa, Ottawa, Ontario, Canada
| | - Pascal M Lavoie
- British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
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26
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A Prospective Observational Cohort Comparison of SARS-CoV-2 Seroprevalence Between Paramedics and Matched Blood Donors in Canada During the COVID-19 Pandemic. Ann Emerg Med 2022; 80:38-45. [PMID: 35461719 PMCID: PMC9021006 DOI: 10.1016/j.annemergmed.2022.03.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/14/2022] [Accepted: 03/08/2022] [Indexed: 11/22/2022]
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27
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Speierer A, Chocano-Bedoya PO, Anker D, Schmid A, Keidel D, Vermes T, Imboden M, Levati S, Franscella G, Corna L, Amati R, Harju E, Luedi C, Michel G, Veys-Takeuchi C, Zuppinger C, Nusslé SG, D’Acremont V, Tall I, Salberg É, Baysson H, Lorthe E, Pennacchio F, Frei A, Kaufmann M, Geigges M, West EA, Schwab N, Cullati S, Chiolero A, Kahlert C, Stringhini S, Vollrath F, Probst-Hensch N, Rodondi N, Puhan MA, von Wyl V. The Corona Immunitas Digital Follow-Up eCohort to Monitor Impacts of the SARS-CoV-2 Pandemic in Switzerland: Study Protocol and First Results. Int J Public Health 2022; 67:1604506. [PMID: 35295967 PMCID: PMC8919370 DOI: 10.3389/ijph.2022.1604506] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 01/20/2022] [Indexed: 01/22/2023] Open
Abstract
Objectives: To describe the rationale, organization, and procedures of the Corona Immunitas Digital Follow-Up (CI-DFU) eCohort and to characterize participants at baseline. Methods: Participants of Corona Immunitas, a population-based nationwide SARS-CoV-2 seroprevalence study in Switzerland, were invited to join the CI-DFU eCohort in 11 study centres. Weekly online questonnaires cover health status changes, prevention measures adherence, and social impacts. Monthly questionnaires cover additional prevention adherence, contact tracing apps use, vaccination and vaccine hesitancy, and socio-economic changes. Results: We report data from the 5 centres that enrolled in the CI-DFU between June and October 2020 (covering Basel City/Land, Fribourg, Neuchâtel, Ticino, Zurich). As of February 2021, 4636 participants were enrolled and 85,693 weekly and 27,817 monthly questionnaires were collected. Design-based oversampling led to overrepresentation of individuals aged 65+ years. People with higher education and income were more likely to enroll and be retained. Conclusion: Broad enrolment and robust retention of participants enables scientifically sound monitoring of pandemic impacts, prevention, and vaccination progress. The CI-DFU eCohort demonstrates proof-of-principle for large-scale, federated eCohort study designs based on jointly agreed principles and transparent governance.
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Affiliation(s)
- Alexandre Speierer
- Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland
- Department of General Internal Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Patricia O. Chocano-Bedoya
- Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland
- Population Health Laboratory (#PopHealthLab), University of Fribourg, Fribourg, Switzerland
| | - Daniela Anker
- Population Health Laboratory (#PopHealthLab), University of Fribourg, Fribourg, Switzerland
| | - Alexia Schmid
- Institute of Family Medicine, University of Fribourg, Fribourg, Switzerland
| | - Dirk Keidel
- Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
| | - Thomas Vermes
- Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
| | - Medea Imboden
- Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
| | - Sara Levati
- Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Lugano, Switzerland
| | - Giovanni Franscella
- Institute of Public Health, Faculty of BioMedicine, Università Della Svizzera Italiana, Lugano, Switzerland
| | - Laurie Corna
- Institute of Public Health, Faculty of BioMedicine, Università Della Svizzera Italiana, Lugano, Switzerland
| | - Rebecca Amati
- Institute of Public Health, Faculty of BioMedicine, Università Della Svizzera Italiana, Lugano, Switzerland
| | - Erika Harju
- Department of Health Sciences and Medicine, University of Luzern, Luzern, Switzerland
| | - Chantal Luedi
- Department of Health Sciences and Medicine, University of Luzern, Luzern, Switzerland
| | - Gisela Michel
- Department of Health Sciences and Medicine, University of Luzern, Luzern, Switzerland
| | - Caroline Veys-Takeuchi
- Department of Epidemiology and Health Systems, Center for Primary Care and Public Health (Unisanté), Lausanne University, Lausanne, Switzerland
| | - Claire Zuppinger
- Department of Epidemiology and Health Systems, Center for Primary Care and Public Health (Unisanté), Lausanne University, Lausanne, Switzerland
| | - Semira Gonseth Nusslé
- Department of Epidemiology and Health Systems, Center for Primary Care and Public Health (Unisanté), Lausanne University, Lausanne, Switzerland
| | - Valérie D’Acremont
- Department of Research and Innovation, Center for Primary Care and Public Health (Unisanté), Lausanne University, Lausanne, Switzerland
| | - Ismaël Tall
- Cantonal Public Health Service, Neuchâtel, Switzerland
| | - Éric Salberg
- Cantonal Public Health Service, Neuchâtel, Switzerland
| | - Hélène Baysson
- Department of Health and Community Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Unit of Population Epidemiology, Division of Primary Care Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Elsa Lorthe
- Unit of Population Epidemiology, Division of Primary Care Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Francesco Pennacchio
- Unit of Population Epidemiology, Division of Primary Care Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Anja Frei
- Epidemiology, Biostatistics and Prevention Institute, Zurich, Switzerland
| | - Marco Kaufmann
- Epidemiology, Biostatistics and Prevention Institute, Zurich, Switzerland
| | - Marco Geigges
- Epidemiology, Biostatistics and Prevention Institute, Zurich, Switzerland
| | - Erin Ashley West
- Epidemiology, Biostatistics and Prevention Institute, Zurich, Switzerland
| | - Nathalie Schwab
- Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland
- Department of General Internal Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Stéphane Cullati
- Population Health Laboratory (#PopHealthLab), University of Fribourg, Fribourg, Switzerland
- Department of Readaptation and Geriatrics, University of Geneva, Geneva, Switzerland
| | - Arnaud Chiolero
- Population Health Laboratory (#PopHealthLab), University of Fribourg, Fribourg, Switzerland
- School of Population and Global Health, McGill University, Montreal, QC, Canada
| | - Christian Kahlert
- Department of Infectious Diseases and Hospital Epidemiology, Cantonal Hospital St. Gallen, St. Gallen, Switzerland
- Infectious Diseases and Hospital Epidemiology, Children’s Hospital of Eastern Switzerland, St. Gallen, Switzerland
| | - Silvia Stringhini
- Department of Health and Community Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Unit of Population Epidemiology, Division of Primary Care Medicine, Geneva University Hospitals, Geneva, Switzerland
- University Center for General Medicine and Public Health, University of Lausanne, Lausanne, Switzerland
| | - Fabian Vollrath
- Corona Immunitas Program Management Group, Swiss School of Public Health, Zurich, Switzerland
| | - Nicole Probst-Hensch
- Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
| | - Nicolas Rodondi
- Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland
- Department of General Internal Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Milo A. Puhan
- Epidemiology, Biostatistics and Prevention Institute, Zurich, Switzerland
| | - Viktor von Wyl
- Institute for Implementation Science in Health Care, University of Zurich, Zurich, Switzerland
- *Correspondence: Viktor von Wyl,
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Vial P, González C, Icaza G, Ramirez-Santana M, Quezada-Gaete R, Núñez-Franz L, Apablaza M, Vial C, Rubilar P, Correa J, Pérez C, Florea A, Guzmán E, Lavín ME, Concha P, Nájera M, Aguilera X. Seroprevalence, spatial distribution, and social determinants of SARS-CoV-2 in three urban centers of Chile. BMC Infect Dis 2022; 22:99. [PMID: 35090398 PMCID: PMC8795965 DOI: 10.1186/s12879-022-07045-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 01/11/2022] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Seroprevalence studies provide an accurate measure of SARS-CoV-2 spread and the presence of asymptomatic cases. They also provide information on the uneven impact of the pandemic, pointing out vulnerable groups to prioritize which is particularly relevant in unequal societies. However, due to their high cost, they provide limited evidence of spatial spread of the pandemic specially in unequal societies. Our objective was to estimate the prevalence of SARS-CoV-2 antibodies in Chile and model its spatial risk distribution. METHODS During Oct-Nov 2020, we conducted a population-based serosurvey in Santiago, Talca, and Coquimbo-La Serena (2493 individuals). We explored the individual association between positive results and socio-economic and health-related variables by logistic regression for complex surveys. Then, using an Empirical Bayesian Kriging model, we estimated the infection risk spatial distribution using individual and census information, and compared these results with official records. RESULTS Seroprevalence was 10.4% (95% CI 7.8-13.7%), ranging from 2% (Talca) to 11% (Santiago), almost three times the number officially reported. Approximately 36% of these were asymptomatic, reaching 82% below 15 years old. Seroprevalence was associated with the city of residence, previous COVID-19 diagnosis, contact with confirmed cases (especially at household), and foreign nationality. The spatial model accurately interpolated the distribution of disease risk within the cities finding significant differences in the predicted probabilities of SARS-CoV-2 infection by census zone (IQR 2.5-15.0%), related to population density and education. CONCLUSIONS Our results underscore the transmission heterogeneity of SARS-CoV-2 within and across three urban centers of Chile. Socio-economic factors and the outcomes of this seroprevalence study enable us to identify priority areas for intervention. Our methodological approach and results can help guide the design of interdisciplinary strategies for urban contexts, not only for SARS-CoV-2 but also for other communicable diseases.
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Grants
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
- , ANID COVID 19-0589 Agencia Nacional de Investigación y Desarrollo
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Affiliation(s)
- Pablo Vial
- Instituto de Ciencias e Innovación en Medicina, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Claudia González
- Centro de Epidemiología y Políticas de Salud, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Gloria Icaza
- Instituto de Matemáticas, Universidad de Talca, Avenida Uno Poniente #1141, 3460000, Talca, Chile
| | - Muriel Ramirez-Santana
- Public Health Department, Faculty of Medicine, Universidad Católica del Norte, Larrondo 1281, 1780000, Coquimbo, Chile
| | - Rubén Quezada-Gaete
- Public Health Department, Faculty of Medicine, Universidad Católica del Norte, Larrondo 1281, 1780000, Coquimbo, Chile
| | - Loreto Núñez-Franz
- Departamento de Salud Pública, Facultad de Ciencias de la Salud, Universidad de Talca, Avenida Uno Poniente #1141, 3460000, Talca, Chile
| | - Mauricio Apablaza
- Facultad de Gobierno, Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Cecilia Vial
- Instituto de Ciencias e Innovación en Medicina, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Paola Rubilar
- Centro de Epidemiología y Políticas de Salud, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Juan Correa
- Centro Producción del Espacio, Universidad de Las Américas, Avenida Manuel Montt #948, 7500975, Providencia, Santiago, Chile
| | - Claudia Pérez
- Escuela de Enfermería, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Andrei Florea
- Instituto de Ciencias e Innovación en Medicina, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Eugenio Guzmán
- Facultad de Gobierno, Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - María-Estela Lavín
- Facultad de Gobierno, Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Paula Concha
- Escuela de Enfermería, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Manuel Nájera
- Centro de Epidemiología y Políticas de Salud, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile
| | - Ximena Aguilera
- Centro de Epidemiología y Políticas de Salud, Facultad de Medicina Clínica Alemana Universidad del Desarrollo, Av. Plaza #680, San Carlos de Apoquindo, 7610658, Las Condes, Santiago, Chile.
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29
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Fogh K, Strange JE, Scharff BFSS, Eriksen ARR, Hasselbalch RB, Bundgaard H, Nielsen SD, Jørgensen CS, Erikstrup C, Norsk J, Nielsen PB, Kristensen JH, Østergaard L, Ellermann-Eriksen S, Andersen B, Nielsen H, Johansen IS, Wiese L, Simonsen L, Fischer TK, Folke F, Lippert F, Ostrowski SR, Benfield T, Mølbak K, Ethelberg S, Koch A, Sönksen UW, Vangsted AM, Krause TG, Fomsgaard A, Ullum H, Skov R, Iversen K. Testing Denmark: a Danish Nationwide Surveillance Study of COVID-19. Microbiol Spectr 2021; 9:e0133021. [PMID: 34908473 PMCID: PMC8672904 DOI: 10.1128/spectrum.01330-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 11/12/2021] [Indexed: 11/20/2022] Open
Abstract
"Testing Denmark" is a national, large-scale, epidemiological surveillance study of SARS-CoV-2 in the Danish population. Between September and October 2020, approximately 1.3 million people (age >15 years) were randomly invited to fill in an electronic questionnaire covering COVID-19 exposures and symptoms. The prevalence of SARS-CoV-2 antibodies was determined by point-of care rapid test (POCT) distributed to participants' home addresses. In total, 318,552 participants (24.5% invitees) completed the study and 2,519 (0.79%) were seropositive. Of the participants with a prior positive PCR test (n = 1,828), 29.1% were seropositive in the POCT. Although seropositivity increased with age, participants 61 years and over reported fewer symptoms and were tested less frequently. Seropositivity was associated with physical contact with SARS-CoV-2 infected individuals (risk ratio [RR] 7.43, 95% CI: 6.57-8.41), particular in household members (RR 17.70, 95% CI: 15.60-20.10). A greater risk of seropositivity was seen in home care workers (RR 2.09, 95% CI: 1.58-2.78) compared to office workers. A high degree of adherence with national preventive recommendations was reported (e.g., >80% use of face masks), but no difference were found between seropositive and seronegative participants. The seroprevalence result was somewhat hampered by a lower-than-expected performance of the POCT. This is likely due to a low sensitivity of the POCT or problems reading the test results, and the main findings therefore relate to risk associations. More emphasis should be placed on age, occupation, and exposure in local communities. IMPORTANCE To date, including 318,522 participants, this is the largest population-based study with broad national participation where tests and questionnaires have been sent to participants' homes. We found that more emphasis from national and local authorities toward the risk of infection should be placed on age of tested individuals, type of occupation, as well as exposure in local communities and households. To meet the challenge that broad nationwide information can be difficult to gather. This study design sets the stage for a novel way of conducting studies. Additionally, this study design can be used as a supplementary model in future general test strategy for ongoing monitoring of COVID-19 immunity in the population, both from past infection and from vaccination against SARS-CoV-2, however, with attention to the complexity of performing and reading the POCT at home.
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Affiliation(s)
- Kamille Fogh
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Emergency Medicine, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Jarl E Strange
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Bibi F S S Scharff
- Department of Clinical Immunology, Copenhagen University Hospitalgrid.4973.9, Rigshospitalet, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Alexandra R R Eriksen
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Emergency Medicine, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Rasmus B Hasselbalch
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Emergency Medicine, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Henning Bundgaard
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Rigshospitalet, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Susanne D Nielsen
- Department of Infectious Diseases, Copenhagen University Hospitalgrid.4973.9, Rigshospitalet, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | | | - Christian Erikstrup
- Statens Serum Institutgrid.6203.7, Copenhagen, Denmark
- Department of Infectious Diseases, Aarhus University Hospitalgrid.154185.c, Aarhus, Denmark
| | - Jakob Norsk
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Emergency Medicine, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Pernille Brok Nielsen
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Emergency Medicine, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Jonas H Kristensen
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Emergency Medicine, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Lars Østergaard
- Statens Serum Institutgrid.6203.7, Copenhagen, Denmark
- Department of Infectious Diseases, Aarhus University Hospitalgrid.154185.c, Aarhus, Denmark
| | - Svend Ellermann-Eriksen
- Statens Serum Institutgrid.6203.7, Copenhagen, Denmark
- Department of Clinical Microbiology, Aarhus University Hospitalgrid.154185.c, Aarhus, Denmark
| | - Berit Andersen
- Statens Serum Institutgrid.6203.7, Copenhagen, Denmark
- University Research Clinic for Cancer Screening, Randers Regional Hospital, Randers, Denmark
| | - Henrik Nielsen
- Department of Infectious Diseases, Aalborg University Hospital, Aalborg, Denmark
- Department of Clinical Medicine, Aalborg University, Odense, Denmark
| | - Isik S Johansen
- Department of Infectious Diseases, Odense University Hospitalgrid.7143.1, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Lothar Wiese
- Department of Infectious Diseases, Zealand University Hospital, Roskilde, Denmark
| | - Lone Simonsen
- Department of Science and Environment, Roskilde University, Roskilde, Denmark
| | - Thea K Fischer
- Department of Clinical Research, North Zealand Hospital, Hillerød, Denmark
- Department of Public health, University of Copenhagen, Copenhagen, Denmark
| | - Fredrik Folke
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Copenhagen Emergency Medical Services, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Freddy Lippert
- Copenhagen Emergency Medical Services, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Sisse R Ostrowski
- Department of Clinical Immunology, Copenhagen University Hospitalgrid.4973.9, Rigshospitalet, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Benfield
- Department of Infectious Diseases, Copenhagen University Hospitalgrid.4973.9, Amager and Hvidovre, Hvidovre, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Kåre Mølbak
- Statens Serum Institutgrid.6203.7, Copenhagen, Denmark
- Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg C, Denmark
| | - Steen Ethelberg
- Statens Serum Institutgrid.6203.7, Copenhagen, Denmark
- Department of Public health, University of Copenhagen, Copenhagen, Denmark
| | - Anders Koch
- Department of Infectious Diseases, Copenhagen University Hospitalgrid.4973.9, Rigshospitalet, Denmark
- Statens Serum Institutgrid.6203.7, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | | | | | | | | | - Henrik Ullum
- Statens Serum Institutgrid.6203.7, Copenhagen, Denmark
| | - Robert Skov
- Statens Serum Institutgrid.6203.7, Copenhagen, Denmark
| | - Kasper Iversen
- Department of Cardiology, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Emergency Medicine, Copenhagen University Hospitalgrid.4973.9, Herlev and Gentofte, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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30
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Alicandro G, Daccó V, Cariani L, Contarini M, Morlacchi LC, Rosazza C, Sciarrabba CS, Ferraro F, Orena BS, Gramegna A, Blasi F, Colombo C. SARS-CoV-2 antibodies among people with cystic fibrosis prior to the vaccination campaign: A seroprevalence study in two specialized centres in Northern Italy. J Cyst Fibros 2021; 21:e113-e116. [PMID: 34949558 PMCID: PMC8666305 DOI: 10.1016/j.jcf.2021.12.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 12/08/2021] [Accepted: 12/10/2021] [Indexed: 01/08/2023]
Abstract
The prevalence of anti-SARS-CoV-2 antibodies in people with cystic fibrosis (CF) is largely unknown. We carried out a cross-sectional study between March and June 2021 with the aim of estimating the seroprevalence of anti-SARS-CoV-2 antibodies in two CF centres in Northern Italy. Total serum anti-SARS-CoV-2 (spike) antibodies levels were measured and values ≥0.8 U/mL were considered positive. Among 434 patients aged >12 years, 64 patients had a positive result (14.7%, 95% CI: 11.5–18.4), 36 (56.3%) without experiencing any COVID-19-related symptoms. Three out of 49 transplanted patients tested positive with an odds ratio for a positive result among transplanted as compared to non-transplanted patients of 0.35 (95% CI: 0.07–1.14). No significant differences were observed between sexes, age groups, socioeconomic status and lung disease severity. In conclusion, SARS-CoV-2 has infected a relatively high proportion of our patients but in most cases the infection was asymptomatic.
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Affiliation(s)
- Gianfranco Alicandro
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Italy; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Cystic Fibrosis Centre, Milan, Italy
| | - Valeria Daccó
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Cystic Fibrosis Centre, Milan, Italy
| | - Lisa Cariani
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Microbiology Unit, Milan, Italy
| | - Martina Contarini
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Respiratory Unit and Adult Cystic Fibrosis Centre, Milan, Italy
| | - Letizia Corinna Morlacchi
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Respiratory Unit and Adult Cystic Fibrosis Centre, Milan, Italy
| | - Chiara Rosazza
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Italy
| | | | - Federica Ferraro
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Cystic Fibrosis Centre, Milan, Italy
| | - Beatrice Silvia Orena
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Microbiology Unit, Milan, Italy
| | - Andrea Gramegna
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Italy; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Respiratory Unit and Adult Cystic Fibrosis Centre, Milan, Italy
| | - Francesco Blasi
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Italy; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Respiratory Unit and Adult Cystic Fibrosis Centre, Milan, Italy
| | - Carla Colombo
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Italy; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Cystic Fibrosis Centre, Milan, Italy.
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Saeed S, Uzicanin S, Lewin A, Lieshout-Krikke R, Faddy H, Erikstrup C, Osiowy C, Seed CR, Steele WR, Davison K, Custer B, O'Brien SF. Current challenges of severe acute respiratory syndrome coronavirus 2 seroprevalence studies among blood donors: A scoping review. Vox Sang 2021; 117:476-487. [PMID: 34862614 DOI: 10.1111/vox.13221] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/04/2021] [Accepted: 09/23/2021] [Indexed: 01/27/2023]
Abstract
BACKGROUND AND OBJECTIVES Blood donors are increasingly being recognized as an informative resource for surveillance. We aimed to review severe acute respiratory syndrome coronavirus 2 seroprevalence studies conducted among blood donors to investigate methodological biases and provide guidance for future research. MATERIALS AND METHODS We conducted a scoping review of peer-reviewed and preprint publications between January 2020 and January 2021. Two reviewers used standardized forms to extract seroprevalence estimates and data on methodology pertaining to population sampling, periodicity, assay characteristics, and antibody kinetics. National data on cumulative incidence and social distancing policies were extracted from publicly available sources and summarized. RESULTS Thirty-three studies representing 1,323,307 blood donations from 20 countries worldwide were included (sample sizes ranged from 22 to 953,926 donations). The majority of the studies (79%) reported seroprevalence rates <10% (ranging from 0% to 76% [after adjusting for waning antibodies]). Overall, less than 1 in 5 studies reported standardized seroprevalence rates to reflect the demographics of the general population. Stratification by age and sex were most common (64% of studies), followed by region (48%). A total of 52% of studies reported seroprevalence at a single time point. Overall, 27 unique assay combinations were identified, 55% of studies used a single assay and only 39% adjusted seroprevalence rates for imperfect test characteristics. Among the nationally representative studies, case detection was most underrepresented in Kenya (1:1264). CONCLUSION By the end of 2020, seroprevalence rates were far from reaching herd immunity. In addition to differences in community transmission and diverse public health policies, study designs and methodology were likely contributing factors to seroprevalence heterogeneity.
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Affiliation(s)
- Sahar Saeed
- Epidemiology and Surveillance, Canadian Blood Services, Ottawa, Ontario, Canada
| | - Samra Uzicanin
- Epidemiology and Surveillance, Canadian Blood Services, Ottawa, Ontario, Canada
| | - Antoine Lewin
- Surveillance and Biological Risk Assessment, Héma-Québec, Montreal, Québec, Canada
| | - Ryanne Lieshout-Krikke
- Department of Medical Affairs, Sanquin Blood Supply Foundation, Amsterdam, The Netherlands
| | - Helen Faddy
- School of Health and Behavioural Sciences, University of the Sunshine Coast, Petrie, Queensland, Australia
| | - Christian Erikstrup
- Department of Clinical Immunology, Aarhus University Hospital, Aarhus, Denmark
| | - Carla Osiowy
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Clive R Seed
- Donor and Product Safety Policy Unit, Australian Red Cross Lifeblood, Perth, Western Australia, Australia
| | - Whitney R Steele
- Epidemiology and Surveillance Group, Scientific Affairs, American Red Cross, Rockville, Maryland, USA
| | - Katy Davison
- NHS Blood and Transplant/Public Health England Epidemiology Unit, London, UK
| | - Brian Custer
- Research and Scientific Programs, Vitalant, San Francisco, California, USA
| | - Sheila F O'Brien
- Epidemiology and Surveillance, Canadian Blood Services, Ottawa, Ontario, Canada
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Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) seroprevalence: Navigating the absence of a gold standard. PLoS One 2021; 16:e0257743. [PMID: 34555095 PMCID: PMC8459951 DOI: 10.1371/journal.pone.0257743] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 09/08/2021] [Indexed: 01/09/2023] Open
Abstract
Background Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) seroprevalence studies bridge the gap left from case detection, to estimate the true burden of the COVID-19 pandemic. While multiple anti-SARS-CoV-2 immunoassays are available, no gold standard exists. Methods This serial cross-sectional study was conducted using plasma samples from 8999 healthy blood donors between April-September 2020. Each sample was tested by four assays: Abbott SARS-Cov-2 IgG assay, targeting nucleocapsid (Abbott-NP) and three in-house IgG ELISA assays (targeting spike glycoprotein, receptor binding domain, and nucleocapsid). Seroprevalence rates were compared using multiple composite reference standards and by a series of Bayesian Latent Class Models. Result We found 13 unique diagnostic phenotypes; only 32 samples (0.4%) were positive by all assays. None of the individual assays resulted in seroprevalence increasing monotonically over time. In contrast, by using the results from all assays, the Bayesian Latent Class Model with informative priors predicted seroprevalence increased from 0.7% (95% credible interval (95% CrI); 0.4, 1.0%) in April/May to 0.7% (95% CrI 0.5, 1.1%) in June/July to 0.9% (95% CrI 0.5, 1.3) in August/September. Assay characteristics varied over time. Overall Spike had the highest sensitivity (93.5% (95% CrI 88.7, 97.3%), while the sensitivity of the Abbott-NP assay waned from 77.3% (95% CrI 58.7, 92.5%) in April/May to 64.4% (95% CrI 45.6, 83.0) by August/September. Discussion Our results confirmed very low seroprevalence after the first wave in Canada. Given the dynamic nature of this pandemic, Bayesian Latent Class Models can be used to correct for imperfect test characteristics and waning IgG antibody signals.
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Popova AY, Smirnov VS, Andreeva EE, Babura EA, Balakhonov SV, Bashketova NS, Bugorkova SA, Bulanov MV, Valeullina NN, Vetrov VV, Goryaev DV, Detkovskaya TN, Ezhlova EB, Zaitseva NN, Istorik OA, Kovalchuk IV, Kozlovskikh DN, Kombarova SY, Kurganova OP, Lomovtsev AE, Lukicheva LA, Lyalina LV, Melnikova AA, Mikailova OM, Noskov AK, Noskova LN, Oglezneva EE, Osmolovskaya TP, Patyashina MA, Penkovskaya NA, Samoilova LV, Stepanova TF, Trotsenko OE, Totolian AA. SARS-CoV-2 Seroprevalence Structure of the Russian Population during the COVID-19 Pandemic. Viruses 2021. [PMID: 34452512 DOI: 10.3390/v13081648.pmid:34452512] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023] Open
Abstract
The SARS-CoV-2 pandemic, which came to Russia in March 2020, is accompanied by morbidity level changes and can be tracked using serological monitoring of a representative population sample from Federal Districts (FDs) and individual regions. In a longitudinal cohort study conducted in 26 model regions of Russia, distributed across all FDs, we investigated the distribution and cumulative proportions of individuals with antibodies (Abs) to the SARS-CoV-2 nucleocapsid antigen (Ag), in the period from June to December 2020, using a three-phase monitoring process. In addition, during the formation of the cohort of volunteers, the number of seropositive convalescents, persons who had contact with patients or COVID-19 convalescents, and the prevalence of asymptomatic forms of infection among seropositive volunteers were determined. According to a uniform methodology, 3 mL of blood was taken from the examined individuals, and plasma was separated, from which the presence of Abs to nucleocapsid Ag was determined on a Thermo Scientific Multiascan FC device using the "ELISA anti-SARS-CoV-2 IgG" reagent set (prod. Scientific Center for Applied Microbiology and Biotechnology), in accordance with the developer's instructions. Volunteers (74,158) were surveyed and divided into seven age groups (1-17, 18-29, 30-39, 40-49, 59-59, 60-69, and 70+ years old), among whom 14,275 were identified as having antibodies to SARS-CoV-2. The average percent seropositive in Russia was 17.8% (IQR: 8.8-23.2). The largest proportion was found among children under 17 years old (21.6% (IQR: 13.1-31.7). In the remaining groups, seroprevalence ranged from 15.6% (IQR: 8-21.1) to 18.0% (IQR: 13.4-22.6). During monitoring, three (immune) response groups were found: (A) groups with a continuous increase in the proportion of seropositive; (B) those with a slow rate of increase in seroprevalence; and (C) those with a two-phase curve, wherein the initial increase was replaced by a decrease in the percentage of seropositive individuals. A significant correlation was revealed between the number of COVID-19 convalescents and contact persons, and between the number of contacts and healthy seropositive volunteers. Among the seropositive volunteers, more than 93.6% (IQR: 87.1-94.9) were asymptomatic. The results show that the COVID-19 pandemic is accompanied by an increase in seroprevalence, which may be important for the formation of herd immunity.
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Affiliation(s)
- Anna Y Popova
- Federal Service for Supervision of Consumer Rights Protection and Human Welfare, 127994 Moscow, Russia
| | | | | | - Elena A Babura
- Rospotrebnadzor Administration in the Kaliningrad Region, 236040 Kaliningrad, Russia
| | | | | | | | - Maxim V Bulanov
- Center for Hygiene and Epidemiology of the Vladimir Region, 600005 Vladimir, Russia
| | - Natalia N Valeullina
- Rospotrebnadzor Administration in the Chelyabinsk Region, 454091 Chelyabinsk, Russia
| | | | - Dmitriy V Goryaev
- Rospotrebnadzor Administration in the Krasnoyarsk Territory, 660049 Krasnoyarsk, Russia
| | | | - Elena B Ezhlova
- Federal Service for Supervision of Consumer Rights Protection and Human Welfare, 127994 Moscow, Russia
| | - Natalia N Zaitseva
- Nizhny Novgorod I. N. Blokhina Research Institute of Epidemiology and Microbiology, 603950 Nizhny Novgorod, Russia
| | - Olga A Istorik
- Rospotrebnadzor Administration in the Leningrad Region, 192029 St. Petersburg, Russia
| | - Irina V Kovalchuk
- Rospotrebnadzor Administration in the Stavropol Territory, 355008 Stavropol, Russia
| | - Dmitriy N Kozlovskikh
- Rospotrebnadzor Administration in the Sverdlovsk Region, 620078 Yekaterinburg, Russia
| | - Svetlana Y Kombarova
- G. N. Gabrichevsky Moscow Research Institute for Epidemiology and Microbiology, 125212 Moscow, Russia
| | - Olga P Kurganova
- Rospotrebnadzor Administration in the Amur Region, 675002 Blagoveshchensk, Russia
| | | | - Lena A Lukicheva
- Rospotrebnadzor Administration in the Murmansk Region, 183038 Murmansk, Russia
| | | | - Albina A Melnikova
- Federal Service for Supervision of Consumer Rights Protection and Human Welfare, 127994 Moscow, Russia
| | - Olga M Mikailova
- Rospotrebnadzor Administration in the Moscow Region, 141014 Mytishchi, Moscow Region, Russia
| | - Alexei K Noskov
- Rostov-on-Don Research Anti-Plague Institute, 344000 Rostov-on-Don, Russia
| | - Ludmila N Noskova
- Rospotrebnadzor Administration for the Astrakhan Region, 414057 Astrakhan, Russia
| | - Elena E Oglezneva
- Rospotrebnadzor Administration in the Belgorod Region, 308023 Belgorod, Russia
| | | | - Marina A Patyashina
- Rospotrebnadzor Administration in the Republic of Tatarstan, 420111 Kazan, Russia
| | | | - Lada V Samoilova
- Rospotrebnadzor Administration in the Novosibirsk Region, 630132 Novosibirsk, Russia
| | - Tatyana F Stepanova
- Tyumen Research Institute of Regional Infectious Pathology, 625026 Tyumen, Russia
| | - Olga E Trotsenko
- Khabarovsk Research Institute of Epidemiology and Microbiology, 680000 Khabarovsk, Russia
| | - Areg A Totolian
- Saint Petersburg Pasteur Institute, 197101 St. Petersburg, Russia
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34
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SARS-CoV-2 Seroprevalence Structure of the Russian Population during the COVID-19 Pandemic. Viruses 2021; 13:v13081648. [PMID: 34452512 PMCID: PMC8402751 DOI: 10.3390/v13081648] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 08/11/2021] [Accepted: 08/11/2021] [Indexed: 12/18/2022] Open
Abstract
The SARS-CoV-2 pandemic, which came to Russia in March 2020, is accompanied by morbidity level changes and can be tracked using serological monitoring of a representative population sample from Federal Districts (FDs) and individual regions. In a longitudinal cohort study conducted in 26 model regions of Russia, distributed across all FDs, we investigated the distribution and cumulative proportions of individuals with antibodies (Abs) to the SARS-CoV-2 nucleocapsid antigen (Ag), in the period from June to December 2020, using a three-phase monitoring process. In addition, during the formation of the cohort of volunteers, the number of seropositive convalescents, persons who had contact with patients or COVID-19 convalescents, and the prevalence of asymptomatic forms of infection among seropositive volunteers were determined. According to a uniform methodology, 3 mL of blood was taken from the examined individuals, and plasma was separated, from which the presence of Abs to nucleocapsid Ag was determined on a Thermo Scientific Multiascan FC device using the “ELISA anti-SARS-CoV-2 IgG” reagent set (prod. Scientific Center for Applied Microbiology and Biotechnology), in accordance with the developer’s instructions. Volunteers (74,158) were surveyed and divided into seven age groups (1–17, 18–29, 30–39, 40–49, 59–59, 60–69, and 70+ years old), among whom 14,275 were identified as having antibodies to SARS-CoV-2. The average percent seropositive in Russia was 17.8% (IQR: 8.8–23.2). The largest proportion was found among children under 17 years old (21.6% (IQR: 13.1–31.7). In the remaining groups, seroprevalence ranged from 15.6% (IQR: 8–21.1) to 18.0% (IQR: 13.4–22.6). During monitoring, three (immune) response groups were found: (A) groups with a continuous increase in the proportion of seropositive; (B) those with a slow rate of increase in seroprevalence; and (C) those with a two-phase curve, wherein the initial increase was replaced by a decrease in the percentage of seropositive individuals. A significant correlation was revealed between the number of COVID-19 convalescents and contact persons, and between the number of contacts and healthy seropositive volunteers. Among the seropositive volunteers, more than 93.6% (IQR: 87.1–94.9) were asymptomatic. The results show that the COVID-19 pandemic is accompanied by an increase in seroprevalence, which may be important for the formation of herd immunity.
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Dodd RY, Spencer BR, Xu M, Foster GA, Saá P, Brodsky JP, Stramer SL. Characteristics of US Blood Donors Testing Reactive for Antibodies to SARS-CoV-2 Prior to the Availability of Authorized Vaccines. Transfus Med Rev 2021; 35:1-7. [PMID: 34373145 PMCID: PMC8321690 DOI: 10.1016/j.tmrv.2021.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 06/28/2021] [Accepted: 07/06/2021] [Indexed: 11/26/2022]
Abstract
In the United States, many blood collection organizations initiated programs to test all blood donors for antibodies to SARS-CoV-2, as a measure to increase donations and to assist in the identification of potential donors of COVID-19 convalescent plasma (CCP). As a result, it was possible to investigate the characteristics of healthy blood donors who had previously been infected with SARS-CoV-2. We report the findings from all blood donations collected by the American Red Cross, representing 40% of the national blood supply covering 44 States, in order to characterize the seroepidemiology of SARS-CoV-2 infection among blood donors in the United States, prior to authorized vaccine availability. We performed an observational cohort study from June 15th to November 30th, 2020 on a population of 1.531 million blood donors tested for antibodies to the S1 spike antigen of SARS-CoV-2 by person, place, time, ABO group and dynamics of test reactivity, with additional information from a survey of a subset of those with reactive test results. The overall seroreactivity was 4.22% increasing from 1.18 to 9.67% (June 2020 - November 2020); estimated incidence was 11.6 per hundred person-years, 1.86-times higher than that based upon reported cases in the general population over the same period. In multivariable analyses, seroreactivity was highest in the Midwest (5.21%), followed by the South (4.43%), West (3.43%) and Northeast (2.90%). Seroreactivity was highest among donors aged 18-24 (Odds Ratio 3.02 [95% Confidence Interval 2.80-3.26] vs age >55), African-Americans and Hispanics (1.50 [1.24-1.80] and 2.12 [1.89-2.36], respectively, vs Caucasian). Group O frequency was 51.5% among nonreactive, but 46.1% among seroreactive donors (P< .0001). Of surveyed donors, 45% reported no COVID-19-related symptoms, but 73% among those unaware of testing. Signal levels of antibody tests were stable over 120 days or more and there was little evidence of reinfection. Evaluation of a large population of healthy, voluntary blood donors provided evidence of widespread and increasing SARS-CoV-2 seroprevalence and demonstrated that at least 45% of those previously infected were asymptomatic. Epidemiologic findings were similar to those among clinically reported cases.
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Affiliation(s)
- Roger Y Dodd
- American Red Cross, Scientific Affairs, Gaithersburg, MD, USA
| | - Bryan R Spencer
- American Red Cross, Scientific Affairs, Gaithersburg, MD, USA
| | - Meng Xu
- American Red Cross, Scientific Affairs, Gaithersburg, MD, USA
| | | | - Paula Saá
- American Red Cross, Scientific Affairs, Gaithersburg, MD, USA
| | | | - Susan L Stramer
- American Red Cross, Scientific Affairs, Gaithersburg, MD, USA.
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