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Backer JA, van de Kassteele J, El Fakiri F, Hens N, Wallinga J. Contact patterns of older adults with and without frailty in the Netherlands during the COVID-19 pandemic. BMC Public Health 2023; 23:1829. [PMID: 37730628 PMCID: PMC10510272 DOI: 10.1186/s12889-023-16725-1] [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: 05/08/2023] [Accepted: 09/08/2023] [Indexed: 09/22/2023] Open
Abstract
BACKGROUND During the COVID-19 pandemic, social distancing measures were imposed to protect the population from exposure, especially older adults and people with frailty, who have the highest risk for severe outcomes. These restrictions greatly reduced contacts in the general population, but little was known about behaviour changes among older adults and people with frailty themselves. Our aim was to quantify how COVID-19 measures affected the contact behaviour of older adults and how this differed between older adults with and without frailty. METHODS In 2021, a contact survey was carried out among people aged 70 years and older in the Netherlands. A random sample of persons per age group (70-74, 75-79, 80-84, 85-89, and 90 +) and gender was invited to participate, either during a period with stringent (April 2021) or moderate (October 2021) measures. Participants provided general information on themselves, including their frailty, and they reported characteristics of all persons with whom they had face-to-face contact on a given day over the course of a full week. RESULTS In total, 720 community-dwelling older adults were included (overall response rate of 15%), who reported 16,505 contacts. During the survey period with moderate measures, participants without frailty had significantly more contacts outside their household than participants with frailty. Especially for females, frailty was a more informative predictor of the number of contacts than age. During the survey period with stringent measures, participants with and without frailty had significantly lower numbers of contacts compared to the survey period with moderate measures. The reduction of the number of contacts was largest for the eldest participants without frailty. As they interact mostly with adults of a similar high age who are likely frail, this reduction of the number of contacts indirectly protects older adults with frailty from SARS-CoV-2 exposure. CONCLUSIONS The results of this study reveal that social distancing measures during the COVID-19 pandemic differentially affected the contact patterns of older adults with and without frailty. The reduction of contacts may have led to the direct protection of older adults in general but also to the indirect protection of older adults with frailty.
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Affiliation(s)
- Jantien A Backer
- National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands.
| | - Jan van de Kassteele
- National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands
| | - Fatima El Fakiri
- Public Health Service of Amsterdam (GGD), Amsterdam, the Netherlands
| | - Niel Hens
- UHasselt, Data Science Institute and I-BioStat, Hasselt, Belgium
- University of Antwerp, Vaccine and Infectious Disease Institute, Antwerp, Belgium
| | - Jacco Wallinga
- National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands
- Leiden University Medical Center, Leiden, the Netherlands
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Joseph K, Chan PSF, Fang Y, Chen S, Mo PKH, Wang Z. Knowledge and practice of personal protective measures against COVID-19 in Africa: a systematic review. JMIR Public Health Surveill 2023; 9:e44051. [PMID: 37058578 DOI: 10.2196/44051] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 03/29/2023] [Accepted: 04/10/2023] [Indexed: 04/16/2023] Open
Abstract
BACKGROUND The Coronavirus disease 2019 (COVID-19) pandemic being a newly evolving disease, its response measures largely depend on the practice of and compliance with personal protective measures (PPMs). OBJECTIVE This systematic review aimed to examine the knowledge and practice of COVID-19 PPMs in African countries, as documented in the published literature. METHODS A systematic search was conducted on Scopus, PubMed, and Web of Science databases using appropriate keywords and predefined eligibility criteria for the selection of relevant studies. Only population-based original research studies (including qualitative, quantitative, and mixed-method studies) done in Africa, and published in the English language were included. The screening process and data extraction were performed according to a pre-registered protocol in PROSPERO (CRD42022355101) and followed the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. The quality of included studies was assessed using the Mixed-Method Appraisal Tool. Thematic analysis was used to systematically summarise the studies into four predefined domains: i) knowledge and perception about PPMs, ii) mask use, iii) social/physical distancing, and iv) hand washing/hygiene, including their respective levels and associated factors. RESULTS A total of 58 studies across 12 African countries were included, and these were published between 2019 and 2022. African communities, including various population groups, had varying levels of knowledge and practice of COVID-19 PPMs, with lack of personal protective equipment (PPE) (mainly face masks), and side effects (among health care workers) being the major reasons for poor compliance. Lower rates of handwashing/ hygiene were particularly noted in several African countries, especially among the urban poor and slum-dwellers, with the main barrier being the lack of safe and clean water. Various cognitive (knowledge and perception), socio-demographic and economic factors were associated with the practice of COVID-19 PPMs. Moreover, there were evident research inequalities on the regional level, where East Africa contributed 36.2%, West Africa 20.7%, North Africa 17.2%, Southern Africa 6.9%, and no single-country study from Central Africa. Nonetheless, the overall quality of the included studies was generally good, as they satisfied most of the quality assessment criteria. CONCLUSIONS There is a need to enhance local capacity to produce and supply PPE. Consideration of various cognitive, demographic and socioeconomic differences, with extra focus on the most vulnerable, is crucial for inclusive and more effective strategies against the pandemic. Moreover, more focus and involvement in community behavioral research are needed to fully understand and address the dynamics of the current pandemic in Africa. CLINICALTRIAL The study protocol was registered in PROSPERO (CRD42022355101).
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Affiliation(s)
- Kawuki Joseph
- Centre for Health Behaviours Research, Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China, Room 508, School of Public Health, Prince of Wales Hospital,, Shatin, N.T., HK
| | - Paul Shing-Fong Chan
- Centre for Health Behaviours Research, Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China, Room 508, School of Public Health, Prince of Wales Hospital,, Shatin, N.T., HK
| | - Yuan Fang
- Department of Health and Physical Education, the Education University of Hong Kong, Hong Kong, China, New Territories, HK
| | - Siyu Chen
- Centre for Health Behaviours Research, Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China, Room 508, School of Public Health, Prince of Wales Hospital,, Shatin, N.T., HK
| | - Phoenix K H Mo
- Centre for Health Behaviours Research, Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China, Room 508, School of Public Health, Prince of Wales Hospital,, Shatin, N.T., HK
| | - Zixin Wang
- Centre for Health Behaviours Research, Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China, Room 508, School of Public Health, Prince of Wales Hospital,, Shatin, N.T., HK
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Backer JA, Bogaardt L, Beutels P, Coletti P, Edmunds WJ, Gimma A, van Hagen CCE, Hens N, Jarvis CI, Vos ERA, Wambua J, Wong D, van Zandvoort K, Wallinga J. Dynamics of non-household contacts during the COVID-19 pandemic in 2020 and 2021 in the Netherlands. Sci Rep 2023; 13:5166. [PMID: 36997550 PMCID: PMC10060924 DOI: 10.1038/s41598-023-32031-7] [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: 10/18/2022] [Accepted: 03/21/2023] [Indexed: 04/04/2023] Open
Abstract
The COVID-19 pandemic was in 2020 and 2021 for a large part mitigated by reducing contacts in the general population. To monitor how these contacts changed over the course of the pandemic in the Netherlands, a longitudinal survey was conducted where participants reported on their at-risk contacts every two weeks, as part of the European CoMix survey. The survey included 1659 participants from April to August 2020 and 2514 participants from December 2020 to September 2021. We categorized the number of unique contacted persons excluding household members, reported per participant per day into six activity levels, defined as 0, 1, 2, 3-4, 5-9 and 10 or more reported contacts. After correcting for age, vaccination status, risk status for severe outcome of infection, and frequency of participation, activity levels increased over time, coinciding with relaxation of COVID-19 control measures.
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Affiliation(s)
- Jantien A Backer
- National Institute for Public Health and the Environment, Bilthoven, The Netherlands.
| | - Laurens Bogaardt
- National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | | | - Pietro Coletti
- UHasselt, Data Science Institute and I-BioStat, Hasselt, Belgium
| | - W John Edmunds
- London School of Hygiene and Tropical Medicine, London, UK
| | - Amy Gimma
- London School of Hygiene and Tropical Medicine, London, UK
| | | | - Niel Hens
- University of Antwerp, Antwerp, Belgium
- UHasselt, Data Science Institute and I-BioStat, Hasselt, Belgium
| | | | - Eric R A Vos
- National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | - James Wambua
- UHasselt, Data Science Institute and I-BioStat, Hasselt, Belgium
| | - Denise Wong
- National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | | | - Jacco Wallinga
- National Institute for Public Health and the Environment, Bilthoven, The Netherlands
- Leiden University Medical Center, Leiden, The Netherlands
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4
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Dobreva Z, Gimma A, Rohan H, Djoudalbaye B, Tshangela A, Jarvis CI, van Zandvoort K, Quaife M. Characterising social contacts under COVID-19 control measures in Africa. BMC Med 2022; 20:344. [PMID: 36221094 PMCID: PMC9553295 DOI: 10.1186/s12916-022-02543-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Accepted: 08/26/2022] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Early in the COVID-19 pandemic, countries adopted non-pharmaceutical interventions (NPIs) such as lockdowns to limit SARS-CoV-2 transmission. Social contact studies help measure the effectiveness of NPIs and estimate parameters for modelling SARS-CoV-2 transmission. However, few contact studies have been conducted in Africa. METHODS We analysed nationally representative cross-sectional survey data from 19 African Union Member States, collected by the Partnership for Evidence-based Responses to COVID-19 (PERC) via telephone interviews at two time points (August 2020 and February 2021). Adult respondents reported contacts made in the previous day by age group, demographic characteristics, and their attitudes towards COVID-19. We described mean and median contacts across these characteristics and related contacts to Google Mobility reports and the Oxford Government Response Stringency Index for each country at the two time points. RESULTS Mean reported contacts varied across countries with the lowest reported in Ethiopia (9, SD=16, median = 4, IQR = 8) in August 2020 and the highest in Sudan (50, SD=53, median = 33, IQR = 40) in February 2021. Contacts of people aged 18-55 represented 50% of total contacts, with most contacts in household and work or study settings for both surveys. Mean contacts increased for Ethiopia, Ghana, Liberia, Nigeria, Sudan, and Uganda and decreased for Cameroon, the Democratic Republic of Congo (DRC), and Tunisia between the two time points. Men had more contacts than women and contacts were consistent across urban or rural settings (except in Cameroon and Kenya, where urban respondents had more contacts than rural ones, and in Senegal and Zambia, where the opposite was the case). There were no strong and consistent variations in the number of mean or median contacts by education level, self-reported health, perceived self-reported risk of infection, vaccine acceptance, mask ownership, and perceived risk of COVID-19 to health. Mean contacts were correlated with Google mobility (coefficient 0.57, p=0.051 and coefficient 0.28, p=0.291 in August 2020 and February 2021, respectively) and Stringency Index (coefficient -0.12, p = 0.304 and coefficient -0.33, p=0.005 in August 2020 and February 2021, respectively). CONCLUSIONS These are the first COVID-19 social contact data collected for 16 of the 19 countries surveyed. We find a high reported number of daily contacts in all countries and substantial variations in mean contacts across countries and by gender. Increased stringency and decreased mobility were associated with a reduction in the number of contacts. These data may be useful to understand transmission patterns, model infection transmission, and for pandemic planning.
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Affiliation(s)
- Zlatina Dobreva
- Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK.
| | - Amy Gimma
- Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK
| | - Hana Rohan
- UK Public Health Rapid Support Team, London School of Hygiene and Tropical Medicine, London, UK
| | | | - Akhona Tshangela
- Africa Centres for Disease Control and Prevention, Addis Ababa, Ethiopia
| | - Christopher I Jarvis
- Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK
| | - Kevin van Zandvoort
- Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK
| | - Matthew Quaife
- Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
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Wu JS, Font X, McCamley C. COVID-19 social distancing compliance mechanisms: UK evidence. ENVIRONMENTAL RESEARCH 2022; 205:112528. [PMID: 34953882 PMCID: PMC8696958 DOI: 10.1016/j.envres.2021.112528] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 11/25/2021] [Accepted: 12/04/2021] [Indexed: 06/14/2023]
Abstract
Non-compliance with social distancing (SD) measures clearly has negative effects on both public health and post-pandemic economic recovery. However, little is as yet known about people's views on and factors influencing their behavioral intentions toward SD measures. This study draws on moral disengagement theory and the norm-activation model to investigate mechanisms that promote or hinder compliance with SD measures. A longitudinal research approach was adopted to compare changes in the main factors over three periods of the COVID-19 pandemic in England (UK). The results reveal significant differences between the three periods regarding intentions to comply with SD measures, altruistic value, moral obligation and moral disengagement, with no significant change in ascription of responsibility. Residents showed the strongest intentions to comply with SD measures during the first national lockdown, with the highest moral obligation and lowest moral disengagement levels, compared with the lowest intention to comply during the first re-opening period. Altruistic value is important in promoting moral obligation and compliance with SD measures, whereas the predictive powers of ascription of responsibility and moral disengagement were weaker than expected. These findings offer guidance to policymakers and researchers in developing more effective policies and public communication strategies. The results suggest that communication is key to normalizing SD compliance, which can be achieved most effectively by fostering residents' altruistic value and moral considerations. Particular attention must be paid to re-opening periods between lockdowns, with clear messages to remind residents of prosocial aspects of SD compliance and public health. In addition to appropriate communication and education, technologies such as apps, QR codes and contactless shopping settings may also be used to facilitate compliance with SD measures.
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Affiliation(s)
- Jialin Snow Wu
- Huddersfield Business School, University of Huddersfield, Huddersfield, UK.
| | - Xavier Font
- School of Hospitality and Tourism Management, University of Surrey, Guildford, UK; Department of Business and Economics, UiT the Arctic University of Norway, Tromsø, Norway
| | - Claire McCamley
- Huddersfield Business School, University of Huddersfield, Huddersfield, UK
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Ochola L, Ogongo P, Mungai S, Gitaka J, Suliman S. Performance Evaluation of Lateral Flow Assays for Coronavirus Disease-19 Serology. Clin Lab Med 2022; 42:31-56. [PMID: 35153047 PMCID: PMC8563367 DOI: 10.1016/j.cll.2021.10.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The coronavirus disease of 2019 (COVID-19) pandemic, caused by infection with the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), has undoubtedly resulted in significant morbidities, mortalities, and economic disruptions across the globe. Affordable and scalable tools to monitor the transmission dynamics of the SARS-CoV-2 virus and the longevity of induced antibodies will be paramount to monitor and control the pandemic as multiple waves continue to rage in many countries. Serologic assays detect humoral responses to the virus, to determine seroprevalence in target populations, or induction of antibodies at the individual level following either natural infection or vaccination. With multiple vaccines rolling out globally, serologic assays to detect anti-SARS-CoV-2 antibodies will be important tools to monitor the development of herd immunity. To address this need, serologic lateral flow assays (LFAs), which can be easily implemented for both population surveillance and home use, will be vital to monitor the evolution of the pandemic and inform containment measures. Such assays are particularly important for monitoring the transmission dynamics and durability of immunity generated by natural infections and vaccination, particularly in resource-limited settings. In this review, we discuss considerations for evaluating the accuracy of these LFAs, their suitability for different use cases, and implementation opportunities.
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Affiliation(s)
- Lucy Ochola
- Department of Tropical and Infectious Diseases, Institute of Primate Research, National Museums of Kenya, PO Box 24481, Nairobi 00502, Kenya
| | - Paul Ogongo
- Department of Tropical and Infectious Diseases, Institute of Primate Research, National Museums of Kenya, PO Box 24481, Nairobi 00502, Kenya; Division of Experimental Medicine, Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Samuel Mungai
- Directorate of Research and Innovation, Mount Kenya University, PO Box 342-01000, Thika, Kenya
| | - Jesse Gitaka
- Directorate of Research and Innovation, Mount Kenya University, PO Box 342-01000, Thika, Kenya
| | - Sara Suliman
- Division of Experimental Medicine, Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA; Division of Rheumatology, Inflammation and Immunity, Brigham and Women's Hospital, Boston, MA 02115, USA.
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7
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Arora S, Grover V, Saluja P, Algarni YA, Saquib SA, Asif SM, Batra K, Alshahrani MY, Das G, Jain R, Ohri A. Literature Review of Omicron: A Grim Reality Amidst COVID-19. Microorganisms 2022; 10:451. [PMID: 35208905 PMCID: PMC8876621 DOI: 10.3390/microorganisms10020451] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 01/26/2022] [Accepted: 02/08/2022] [Indexed: 02/04/2023] Open
Abstract
Coronavirus disease 2019 (COVID-19) first emerged in Wuhan city in December 2019, and became a grave global concern due to its highly infectious nature. The Severe Acute Respiratory Coronavirus-2, with its predecessors (i.e., MERS-CoV and SARS-CoV) belong to the family of Coronaviridae. Reportedly, COVID-19 has infected 344,710,576 people around the globe and killed nearly 5,598,511 persons in the short span of two years. On November 24, 2021, B.1.1.529 strain, later named Omicron, was classified as a Variant of Concern (VOC). SARS-CoV-2 has continuously undergone a series of unprecedented mutations and evolved to exhibit varying characteristics. These mutations have largely occurred in the spike (S) protein (site for antibody binding), which attribute high infectivity and transmissibility characteristics to the Omicron strain. Although many studies have attempted to understand this new challenge in the COVID-19 strains race, there is still a lot to be demystified. Therefore, the purpose of this review was to summarize the structural or virologic characteristics, burden, and epidemiology of the Omicron variant and its potential to evade the immune response.
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Affiliation(s)
- Suraj Arora
- Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha 61321, Saudi Arabia;
| | - Vishakha Grover
- Department of Periodontology and Oral Implantology, Dr. H.S.J. Institute of Dental Sciences, Panjab University, Chandigarh 160014, India; (V.G.); (A.O.)
| | - Priyanka Saluja
- Department of Conservative Dentistry and Endodontics, JCD Dental College, Sirsa 125055, India
| | - Youssef Abdullah Algarni
- Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha 61321, Saudi Arabia;
| | - Shahabe Abullais Saquib
- Department of Periodontics and Community Dental Sciences, College of Dentistry, King Khalid University, Abha 61321, Saudi Arabia;
| | - Shaik Mohammed Asif
- Department of Diagnostic Sciences and Oral Biology, College of Dentistry, King Khalid University, Abha 61321, Saudi Arabia;
| | - Kavita Batra
- Biomedical Statistician, Office of Research, Kirk Kerkorian School of Medicine at University of Nevada, 2040 W. Charleston Blvd., Las Vegas, NV 89102, USA;
| | - Mohammed Y. Alshahrani
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha 61321, Saudi Arabia;
| | - Gotam Das
- Department of Prosthodontics, College of Dentistry, King Khalid University, Abha 61321, Saudi Arabia
| | - Rajni Jain
- Department of Prosthodontics, Dr. H.S.J. Institute of Dental Sciences & Hospital, Punjab University, Chandigarh 160014, India;
| | - Anchal Ohri
- Department of Periodontology and Oral Implantology, Dr. H.S.J. Institute of Dental Sciences, Panjab University, Chandigarh 160014, India; (V.G.); (A.O.)
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8
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Mousa A, Winskill P, Watson OJ, Ratmann O, Monod M, Ajelli M, Diallo A, Dodd PJ, Grijalva CG, Kiti MC, Krishnan A, Kumar R, Kumar S, Kwok KO, Lanata CF, le Polain de Waroux O, Leung K, Mahikul W, Melegaro A, Morrow CD, Mossong J, Neal EF, Nokes DJ, Pan-Ngum W, Potter GE, Russell FM, Saha S, Sugimoto JD, Wei WI, Wood RR, Wu J, Zhang J, Walker P, Whittaker C. Social contact patterns and implications for infectious disease transmission: a systematic review and meta-analysis of contact surveys. eLife 2021; 10:70294. [PMID: 34821551 PMCID: PMC8765757 DOI: 10.7554/elife.70294] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 11/24/2021] [Indexed: 11/13/2022] Open
Abstract
Background: Transmission of respiratory pathogens such as SARS-CoV-2 depends on patterns of contact and mixing across populations. Understanding this is crucial to predict pathogen spread and the effectiveness of control efforts. Most analyses of contact patterns to date have focused on high-income settings. Methods: Here, we conduct a systematic review and individual-participant meta-analysis of surveys carried out in low- and middle-income countries and compare patterns of contact in these settings to surveys previously carried out in high-income countries. Using individual-level data from 28,503 participants and 413,069 contacts across 27 surveys, we explored how contact characteristics (number, location, duration, and whether physical) vary across income settings. Results: Contact rates declined with age in high- and upper-middle-income settings, but not in low-income settings, where adults aged 65+ made similar numbers of contacts as younger individuals and mixed with all age groups. Across all settings, increasing household size was a key determinant of contact frequency and characteristics, with low-income settings characterised by the largest, most intergenerational households. A higher proportion of contacts were made at home in low-income settings, and work/school contacts were more frequent in high-income strata. We also observed contrasting effects of gender across income strata on the frequency, duration, and type of contacts individuals made. Conclusions: These differences in contact patterns between settings have material consequences for both spread of respiratory pathogens and the effectiveness of different non-pharmaceutical interventions. Funding: This work is primarily being funded by joint Centre funding from the UK Medical Research Council and DFID (MR/R015600/1). Infectious diseases, particularly those caused by airborne pathogens like SARS-CoV-2, spread by social contact, and understanding how people mix is critical in controlling outbreaks. To explore these patterns, researchers typically carry out large contact surveys. Participants are asked for personal information (such as gender, age and occupation), as well as details of recent social contacts, usually those that happened in the last 24 hours. This information includes, the age and gender of the contact, where the interaction happened, how long it lasted, and whether it involved physical touch. These kinds of surveys help scientists to predict how infectious diseases might spread. But there is a problem: most of the data come from high-income countries, and there is evidence to suggest that social contact patterns differ between places. Therefore, data from these countries might not be useful for predicting how infections spread in lower-income regions. Here, Mousa et al. have collected and combined data from 27 contact surveys carried out before the COVID-19 pandemic to see how baseline social interactions vary between high- and lower-income settings. The comparison revealed that, in higher-income countries, the number of daily contacts people made decreased with age. But, in lower-income countries, younger and older individuals made similar numbers of contacts and mixed with all age groups. In higher-income countries, more contacts happened at work or school, while in low-income settings, more interactions happened at home and people were also more likely to live in larger, intergenerational households. Mousa et al. also found that gender affected how long contacts lasted and whether they involved physical contact, both of which are key risk factors for transmitting airborne pathogens. These findings can help researchers to predict how infectious diseases might spread in different settings. They can also be used to assess how effective non-medical restrictions, like shielding of the elderly and workplace closures, will be at reducing transmissions in different parts of the world.
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Affiliation(s)
- Andria Mousa
- MRC Centre for Global Infectious Disease Analysis, Imperial College London, London, United Kingdom
| | - Peter Winskill
- MRC Centre for Global Infectious Disease Analysis, Imperial College London, London, United Kingdom
| | - Oliver John Watson
- MRC Centre for Global Infectious Disease Analysis, Imperial College London, London, United Kingdom
| | - Oliver Ratmann
- Department of Mathematics, Imperial College London, London, United Kingdom
| | - Mélodie Monod
- Department of Mathematics, Imperial College London, London, United Kingdom
| | - Marco Ajelli
- Department of Epidemiology and Biostatistics, Indiana University School of Public Health, Bloomington, United States
| | - Aldiouma Diallo
- VITROME, Institut de Recherche pour le Developpement, Dakar, Senegal
| | - Peter J Dodd
- School of Health and Related Research, University of Sheffield, Sheffield, United Kingdom
| | - Carlos G Grijalva
- Division of Pharmacoepidemiology, Department of Health Policy, Vanderbilt University Medical Center, Nashville, United States
| | | | - Anand Krishnan
- Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Rakesh Kumar
- Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Supriya Kumar
- Bill and Melinda Gates Foundation, Seattle, WA, United States
| | - Kin O Kwok
- JC School of Public Health and Primary Care, Chinese University of Hong Kong, Hong Kong, China
| | | | | | - Kathy Leung
- School of Public Health, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Wiriya Mahikul
- Faculty of Medicine and Public Health, HRH Princess Chulabhorn College of Medical Science, Chulabhorn Royal Academy, Bangkok, Thailand
| | - Alessia Melegaro
- Dondena Centre for Research on Social Dynamics and Public Policy, Department of Social and Political Sciences, Bocconi University, Milano, Italy
| | - Carl D Morrow
- Desmond Tutu HIV Centre, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | | | - Eleanor Fg Neal
- Infection and Immunity, Murdoch Children's Research Institute, Victoria, Australia
| | - D James Nokes
- KEMRI-Wellcome Trust Research Programme, Kilifi, Kenya
| | | | - Gail E Potter
- National Institute for Allergies and Infectious Diseases, National Institutes of Health, Rockville, United States
| | - Fiona M Russell
- Infection and Immunity, Murdoch Children's Research Institute, Victoria, Australia
| | - Siddhartha Saha
- US Centers for Disease Control and Prevention, New Delhi, India
| | - Jonathan D Sugimoto
- Seattle Epidemiologic Research and Information Center, United States Department of Veterans Affairs, Seattle, United States
| | - Wan In Wei
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China
| | - Robin R Wood
- Desmond Tutu HIV Centre, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Joseph Wu
- School of Public Health, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Juanjuan Zhang
- School of Public Health, Fudan University, Shanghai, China
| | - Patrick Walker
- MRC Centre for Global Infectious Disease Analysis, Imperial College London, London, United Kingdom
| | - Charles Whittaker
- MRC Centre for Global Infectious Disease Analysis, Imperial College London, London, United Kingdom
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