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Padoan A, Cosma C, Di Chiara C, Furlan G, Gastaldo S, Talli I, Donà D, Basso D, Giaquinto C, Plebani M. Clinical and Analytical Performance of ELISA Salivary Serologic Assay to Detect SARS-CoV-2 IgG in Children and Adults. Antibodies (Basel) 2024; 13:6. [PMID: 38247570 PMCID: PMC10801479 DOI: 10.3390/antib13010006] [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: 11/20/2023] [Revised: 12/19/2023] [Accepted: 12/28/2023] [Indexed: 01/23/2024] Open
Abstract
Saliva is a promising matrix with several purposes. Our aim is to verify if salivary anti-SARS-CoV-2 antibody determination is suitable for monitoring immune responses. One hundred eighty-seven subjects were enrolled at University-Hospital Padova: 105 females (56.1%) and 82 males (43.9%), 95 (50.8%) children and 92 (49.2%) adults. Subjects self-collected saliva using Salivette; nineteen subjects collected three different samples within the day. A serum sample was obtained for all individuals. The N/S anti-SARS-CoV-2 salivary IgG (sal-IgG) and serum anti-SARS-CoV-2 S-RBD IgG (ser-IgG) were used for determining anti-SARS-CoV-2 antibodies. The mean (min-max) age was 9.0 (1-18) for children and 42.5 (20-61) for adults. Of 187 samples, 63 were negative for sal-IgG (33.7%), while 7 were negative for ser-IgG (3.7%). Spearman's correlation was 0.56 (p < 0.001). Sal-IgG and ser-IgG levels were correlated with age but not with gender, comorbidities, prolonged therapy, previous SARS-CoV-2 infection, or time from last COVID-19 infection/vaccination. The repeatability ranged from 23.8% (7.4 kAU/L) to 4.0% (3.77 kAU/L). The linearity of the assay was missed in 4/6 samples. No significant intrasubject differences were observed in sal-IgG across samples collected at different time points. Sal-IgG has good agreement with ser-IgG. Noninvasive saliva collection represents an alternative method for antibody measurement, especially in children.
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Affiliation(s)
- Andrea Padoan
- Department of Medicine (DIMED), University of Padova, 35128 Padova, Italy; (A.P.); (C.C.); (D.B.); (M.P.)
- UOC of Laboratory Medicine, University-Hospital of Padova, 35128 Padova, Italy
- QI.LAB.MED, Spin-off of the University of Padova, 35011 Padova, Italy;
| | - Chiara Cosma
- Department of Medicine (DIMED), University of Padova, 35128 Padova, Italy; (A.P.); (C.C.); (D.B.); (M.P.)
- UOC of Laboratory Medicine, University-Hospital of Padova, 35128 Padova, Italy
- QI.LAB.MED, Spin-off of the University of Padova, 35011 Padova, Italy;
| | - Costanza Di Chiara
- Department of Women’s and Children’s Health, University of Padova, 35128 Padova, Italy (S.G.); (D.D.); (C.G.)
- Penta–Child Health Research, 35127 Padua, Italy
| | - Giulia Furlan
- QI.LAB.MED, Spin-off of the University of Padova, 35011 Padova, Italy;
| | - Stefano Gastaldo
- Department of Women’s and Children’s Health, University of Padova, 35128 Padova, Italy (S.G.); (D.D.); (C.G.)
| | - Ilaria Talli
- Department of Medicine (DIMED), University of Padova, 35128 Padova, Italy; (A.P.); (C.C.); (D.B.); (M.P.)
- UOC of Laboratory Medicine, University-Hospital of Padova, 35128 Padova, Italy
| | - Daniele Donà
- Department of Women’s and Children’s Health, University of Padova, 35128 Padova, Italy (S.G.); (D.D.); (C.G.)
- Penta–Child Health Research, 35127 Padua, Italy
| | - Daniela Basso
- Department of Medicine (DIMED), University of Padova, 35128 Padova, Italy; (A.P.); (C.C.); (D.B.); (M.P.)
- UOC of Laboratory Medicine, University-Hospital of Padova, 35128 Padova, Italy
- QI.LAB.MED, Spin-off of the University of Padova, 35011 Padova, Italy;
| | - Carlo Giaquinto
- Department of Women’s and Children’s Health, University of Padova, 35128 Padova, Italy (S.G.); (D.D.); (C.G.)
- Penta–Child Health Research, 35127 Padua, Italy
| | - Mario Plebani
- Department of Medicine (DIMED), University of Padova, 35128 Padova, Italy; (A.P.); (C.C.); (D.B.); (M.P.)
- UOC of Laboratory Medicine, University-Hospital of Padova, 35128 Padova, Italy
- QI.LAB.MED, Spin-off of the University of Padova, 35011 Padova, Italy;
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Ören MM, Canbaz S, Meşe S, Ağaçfidan A, Demir ÖS, Karaca E, Doğruyol AR, Otçu GH, Tükek T, Özgülnar N. Impact of Health Workers' Choice of COVID-19 Vaccine Booster on Immunization Levels in Istanbul, Turkey. Vaccines (Basel) 2023; 11:vaccines11050935. [PMID: 37243039 DOI: 10.3390/vaccines11050935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/28/2023] [Accepted: 05/02/2023] [Indexed: 05/28/2023] Open
Abstract
BACKGROUND There are limited data regarding short- and medium-term IgG antibody levels after the CoronaVac and BNT162b2 vaccines. This study aimed to investigate the antibody responses of health workers who initially received two doses of CoronaVac one month apart followed by a booster dose of either CoronaVac or BNT162b2, as well as determine whether either vaccine provided superior results. METHODS This research represents the second phase of a mixed-methods vaccine cohort study and was conducted between July 2021 and February 2022. The participants (n = 117) were interviewed in person and blood samples were collected before and at 1 and 6 months after the booster vaccination. RESULTS BNT162b2 was found to have greater immunogenic potential than CoronaVac (p < 0.001). Health workers without chronic disease exhibited statistically significant increases in antibody levels after both vaccines (p < 0.001), whereas only BNT162b2 caused a significant increase in antibody levels in participants with chronic disease (p < 0.001). Samples obtained before and at 1 and 6 months after the booster vaccination revealed no age- or sex-based differences in IgG-inducing potential for either vaccine (p > 0.05). Antibody levels were comparable in both vaccine groups before the booster regardless of COVID-19 history (p > 0.05); however, antibody levels were significantly higher after the BNT162b2 booster at 1 month (<0.001) and at 6 months, except among participants who had a positive history of COVID-19 infection (p < 0.001). CONCLUSIONS Our results suggest that even a single booster dose of BNT162b2 after initial vaccination with CoronaVac provides a protective advantage against COVID-19, especially for risk groups such as health workers and those with chronic diseases.
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Affiliation(s)
- Meryem Merve Ören
- Department of Public Health, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Sevgi Canbaz
- Department of Public Health, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Sevim Meşe
- Department of Medical Microbiology, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Ali Ağaçfidan
- Department of Medical Microbiology, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Ömer Serdil Demir
- Department of Public Health, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Esra Karaca
- Department of Public Health, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Ayşe Rumeysa Doğruyol
- Department of Public Health, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Gökçe Hazar Otçu
- Department of Public Health, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Tufan Tükek
- Department of Internal Medicine, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Nuray Özgülnar
- Department of Public Health, Istanbul Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
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Csoma E, Nagy Koroknai Á, Sütő R, Szakács Szilágyi E, Pócsi M, Nagy A, Bíró K, Kappelmayer J, Nagy B. Evaluation of the Diagnostic Performance of Two Automated SARS-CoV-2 Neutralization Immunoassays following Two Doses of mRNA, Adenoviral Vector, and Inactivated Whole-Virus Vaccinations in COVID-19 Naïve Subjects. Microorganisms 2023; 11:1187. [PMID: 37317161 DOI: 10.3390/microorganisms11051187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 04/17/2023] [Accepted: 04/27/2023] [Indexed: 06/16/2023] Open
Abstract
BACKGROUND Limited data are available on humoral responses determined by automated neutralization tests following the administration of the three different types of COVID-19 vaccinations. Thus, we here evaluated anti-SARS-CoV-2 neutralizing antibody titers via two different neutralization assays in comparison to total spike antibody levels. METHODS Healthy participants (n = 150) were enrolled into three subgroups who were tested 41 (22-65) days after their second dose of mRNA (BNT162b2/mRNA-1273), adenoviral vector (ChAdOx1/Gam-COVID-Vac) and inactivated whole-virus (BBIBP-CorV) vaccines, with no history or serologic evidence of prior SARS-CoV-2 infection. Neutralizing antibody (N-Ab) titers were analyzed on a Snibe Maglumi® 800 instrument and a Medcaptain Immu F6® Analyzer in parallel to anti-SARS-CoV-2 S total antibody (S-Ab) levels (Roche Elecsys® e602). RESULTS Subjects who were administered mRNA vaccines demonstrated significantly higher SARS-CoV-2 N-Ab and S-Ab levels compared to those who received adenoviral vector and inactivated whole-virus vaccinations (p < 0.0001). N-Ab titers determined by the two methods correlated with each other (r = 0.9608; p < 0.0001) and S-Ab levels (r = 0.9432 and r = 0.9324; p < 0.0001, respectively). Based on N-Ab values, a new optimal threshold of Roche S-Ab was calculated (166 BAU/mL) for discrimination of seropositivity showing an AUC value of 0.975 (p < 0.0001). Low post-vaccination N-Ab levels (median value of 0.25 μg/mL or 7.28 AU/mL) were measured in those participants (n = 8) who were infected by SARS-CoV-2 within 6 months after immunizations. CONCLUSION Both SARS-CoV-2 N-Ab automated assays are effective to evaluate humoral responses after various COVID-19 vaccines.
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Affiliation(s)
- Eszter Csoma
- Department of Medical Microbiology, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
| | - Ágnes Nagy Koroknai
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
| | - Renáta Sütő
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
- Intensive Care Unit, Gyula Kenézy Campus, University of Debrecen, Bartók Béla út 2-26, 4031 Debrecen, Hungary
- Doctoral School of Kálmán Laki, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
| | - Erika Szakács Szilágyi
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
| | - Marianna Pócsi
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
| | - Attila Nagy
- Department of Health Informatics, Institute of Health Sciences, Faculty of Health, University of Debrecen, Kassai út 26, 4028 Debrecen, Hungary
| | - Klára Bíró
- Institute of Health Economics and Management, Faculty of Economics and Business, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
| | - János Kappelmayer
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
| | - Béla Nagy
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
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The Influence of Booster Shot and SARS-CoV-2 Infection on the Anti-Spike Antibody Concentration One Year after the First COVID-19 Vaccine Dose Administration. Vaccines (Basel) 2023; 11:vaccines11020278. [PMID: 36851157 PMCID: PMC9962896 DOI: 10.3390/vaccines11020278] [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: 12/15/2022] [Revised: 01/20/2023] [Accepted: 01/24/2023] [Indexed: 01/31/2023] Open
Abstract
This study pictures the humoral response of 100 vaccinees to Pfizer/BioNTech COVID-19 vaccine over a year, with particular focus on the influence of a booster shot administered around 10 months after the primary immunization. The response to the vaccination was assessed with Diasorin's SARS-CoV-2 TrimericSpike IgG. Abbott's SARS-CoV-2 Nucleocapsid IgG immunoassay was used to identify SARS-CoV-2 contact, even asymptomatic. In contrast to the gradual decline of the anti-spike IgG between 30 and 240 days after the first dose, an increase was noted between days 240 and 360 in the whole cohort. However, a statistically significant rise was seen only in boosted individuals, and this effect of the booster decreased over time. An increase was also observed in non-boosted but recently infected participants and a decrease was reported in non-boosted, non-infected subjects. These changes were not statistically significant. On day 360, a percentage of new SARS-CoV-2 infections was statistically lower in the boosted vs. non-boosted subgroups. The booster immunization is the most efficient way of stimulating production of anti-spike, potentially neutralizing antibodies. The response is additionally enhanced by the natural contact with the virus. Individuals with a low level of anti-spike antibodies may benefit the most from the booster dose administration.
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Perrier Q, Lupo J, Gerster T, Augier C, Falque L, Rostaing L, Pelletier L, Bedouch P, Blanc M, Saint-Raymond C, Boignard A, Bonadona A, Noble J, Epaulard O. SARS-CoV-2 anti-spike antibodies after a fourth dose of COVID-19 vaccine in adult solid-organ transplant recipients. Vaccine 2022; 40:6404-6411. [PMID: 36184404 PMCID: PMC9444490 DOI: 10.1016/j.vaccine.2022.08.065] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 08/16/2022] [Accepted: 08/28/2022] [Indexed: 01/27/2023]
Abstract
BACKGROUND A fourth dose of SARS-CoV-2 vaccine is recommended in solid-organ transplant (SOT) recipients, but the immunogenicity is poorly known. METHODS We conducted a retrospective, observational, monocentric study between the 1st January 2021 and 31st March 2022 of the anti-Spike antibody titers after one to four doses of vaccine in SOT. RESULTS 825 SOT were included. Median age at first vaccine injection was 61.2 (IQR 50.9-69.3) years; 66.7 % were male; 63.4 % had received four vaccine doses. The proportion of participants with a strong humoral response (>260 BAU/mL) increased with the number of vaccine doses: 10.6 % after the 1st dose (D1), 35.1 % after the 2nd (D2), 48.5 % after the 3rd (D3), and 65.1 % after the 4th (D4) (p < 0.001). Among the tested patients, the proportion with a detectable humoral response was significantly higher after D4 than after D3 (47 % vs 22 %, p = 0.01). Liver transplant recipients had more frequently a strong humoral response after D2, D3 and D4 (OR = 5.3, 3.7 and 6.6 respectively when compared with other organ transplant recipients, p < 0.001). In kidney transplant recipients, belatacept-containing regimen was associated with a lower rate of detectable humoral (9 % vs 40 %, p = 0.025) after D3, but there was no statistical difference after D4. CONCLUSION A fourth dose should be proposed to SOT recipients who did not developed an immune response after 3 doses. Kidney transplant recipients receiving belatacept have a poorer, although frequently detectable response.
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Affiliation(s)
- Quentin Perrier
- Pharmacy Department, Grenoble Alpes University Hospital and Univ. Grenoble Alpes, Laboratory of Fundamental and Applied Bioenergetic (LBFA), INSERM U1055, Grenoble, France
| | - Julien Lupo
- Virology Laboratory, Grenoble Alpes University Hospital and Univ. Grenoble Alpes, Institut de Biologie Structurale (IBS), CEA, CNRS, Grenoble, France
| | - Théophile Gerster
- Hepatogastroenterology Department, Grenoble Alpes University Hospital, Grenoble, France
| | - Caroline Augier
- Cardiology Department, Grenoble Alpes University Hospital, Grenoble, France
| | - Loïc Falque
- Pneumology and Physiology Department, Grenoble Alpes University Hospital, Grenoble, France
| | - Lionel Rostaing
- Nephrology, Hemodialysis, Apheresis and Kidney Transplantation Department, Grenoble Alpes University Hospital and Univ. Grenoble Alpes, Grenoble, France
| | - Laurent Pelletier
- Virology Laboratory, Grenoble Alpes University Hospital, Grenoble, France
| | - Pierrick Bedouch
- Pharmacy Department, Grenoble Alpes University Hospital and Univ. Grenoble Alpes, CNRS, TIMC-IMAG, Grenoble, France
| | - Myriam Blanc
- Infectious Diseases Department, Grenoble Alpes University Hospital and Univ. Grenoble Alpes, Groupe de Recherche en Infectiologie Clinique, CIC-1406, INSERM, Grenoble, France
| | - Christel Saint-Raymond
- Pneumology and Physiology Department, Grenoble Alpes University Hospital, Grenoble, France
| | - Aude Boignard
- Cardiology Department, Grenoble Alpes University Hospital, Grenoble, France
| | - Agnès Bonadona
- Hepatogastroenterology Department, Grenoble Alpes University Hospital, Grenoble, France
| | - Johan Noble
- Nephrology, Hemodialysis, Apheresis and Kidney Transplantation Department, Grenoble Alpes University Hospital and Univ. Grenoble Alpes, Grenoble, France
| | - Olivier Epaulard
- Infectious Diseases Department, Grenoble Alpes University Hospital and Univ. Grenoble Alpes, Groupe de Recherche en Infectiologie Clinique, CIC-1406, INSERM, Grenoble, France,Corresponding author at: Service des maladie infectieuses, CHU Grenoble Alpes, France
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Salvagno GL, Henry BM, Pighi L, De Nitto S, Lippi G. Variation of Total Anti-SARS-CoV-2 Antibodies After Primary BNT162b2 Vaccination and Homologous Booster. EJIFCC 2022; 33:166-174. [PMID: 36313914 PMCID: PMC9562482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND In this serosurveillance study, we investigated the variation of total anti-SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) antibodies in healthcare workers receiving primary BNT162b2 vaccination and homologous booster. METHODS A total number of 524 subjects (median age, 46 years; 65.3% females), were studied. All received primary BNT162b2 vaccination (two doses) and homologous booster (one dose) >8 months after completing the primary cycle. Blood samples were collected before the first and second vaccine doses, at 1, 3 and 6 months after the second dose, as well as before and 1 month after booster. Total anti-SARS-CoV-2 neutralizing antibodies were assayed with Roche Elecsys Anti-SARS-CoV-2 S chemiluminescent immunoassay. RESULTS Overall, 65.1% subjects were baseline (i.e., pre-vaccination) SARS-CoV-2 seronegative and always tested SARS-CoV-2 negative ("N/N"), 16.2% were baseline SARS-CoV-2 seronegative but tested SARS-CoV-2 positive after receiving the vaccine booster dose ("N/P"), whilst 18.7% were baseline SARS-CoV-2 seropositive and always tested SARS-CoV-2 negative afterwards ("P/N"). All groups displayed a similar trend of total anti-SARS-CoV-2 S antibodies throughout the study period, though the P/N cohort exhibited higher values compared to the other two groups until receiving the booster, after which the levels become similar in all cohorts. Significant differences in total anti-SARS-CoV-2 S antibodies values were not found between N/N and N/P groups, neither 1 month after booster. The rate of subjects with protective antibodies values become 100% in all groups after booster. CONCLUSIONS Although baseline seropositivity is associated with more pronounced humoral immune response following primary vaccination compared to never infected subjects, SARS-CoV-2 infection after booster does not significantly foster antibody titers.
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Affiliation(s)
- Gian Luca Salvagno
- Section of Clinical Biochemistry, University of Verona, Verona, Italy, Service of Laboratory Medicine, Pederzoli Hospital, Peschiera del Garda, Italy
| | - Brandon M. Henry
- Clinical Laboratory, Division of Nephrology and Hypertension, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Laura Pighi
- Section of Clinical Biochemistry, University of Verona, Verona, Italy, Service of Laboratory Medicine, Pederzoli Hospital, Peschiera del Garda, Italy
| | - Simone De Nitto
- Section of Clinical Biochemistry, University of Verona, Verona, Italy, Service of Laboratory Medicine, Pederzoli Hospital, Peschiera del Garda, Italy
| | - Giuseppe Lippi
- Section of Clinical Biochemistry, University of Verona, Verona, Italy,Corresponding authors: Prof. Giuseppe Lippi Section of Clinical Biochemistry University Hospital of Verona Piazzale L.A. Scuro, 10 37134 Verona Italy Phone: 0039-045-8122970 Fax: 0039-045-8124308 E-mail:
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Xue JH, Wang YJ, Li W, Li QL, Xu QY, Niu JJ, Liu LL. Anti-Receptor-Binding Domain Immunoglobulin G Antibody as a Predictor of Seropositivity for Anti-SARS-CoV-2 Neutralizing Antibody. Arch Pathol Lab Med 2022; 146:814-821. [PMID: 35380612 DOI: 10.5858/arpa.2022-0041-sa] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/30/2022] [Indexed: 12/24/2022]
Abstract
CONTEXT.— Neutralizing antibody detection can assess the incidence of COVID-19 and the effectiveness of vaccines. However, commercial reagents for neutralizing antibodies were developed after the anti-SARS-CoV-2 immunoglobulin (Ig) G and IgM antibodies. Therefore, some laboratories did not perform neutralizing antibody testing services because of multiple factors. OBJECTIVE.— To find a fast, accurate, and economic alternative for the detection of neutralizing antibodies for the development of COVID-19 screening programs. DESIGN.— The response and correlation of 3 antibodies (anti-spike protein neutralizing antibody, total anti-receptor-binding domain [RBD] antibody, and anti-RBD IgG) were determined by observing the dynamics in 61 participants for 160 days after vaccination. RESULTS.— The levels of neutralizing and anti-RBD IgG antibodies reached their peak values on day 42 after vaccination (120.75 IU/mL and 14.38 signal-to-cutoff ratio [S/CO], respectively). The total antibody levels peaked at 138.47 S/CO on day 35 after vaccination. The strongest correlation was found between neutralizing and anti-RBD IgG antibody levels (r = 0.894, P < .001). The area under the receiver operating characteristic curve for total antibody levels for the prediction of seropositivity for neutralizing antibodies was 0.881 (P < .001), and that for anti-RBD IgG antibody levels was 0.937 (P < .001). CONCLUSIONS.— Neutralizing and anti-RBD IgG antibody levels were strongly correlated, and thus anti-RBD IgG antibody levels can be used for the accurate assessment of immunity following SARS-CoV-2 infection or vaccination.
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Affiliation(s)
- Jian-Hang Xue
- From the Clinical Laboratory Center, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China (Xue, Wang, W. Li, Q.L. Li, Xu, Niu, Liu).,From the Department of Epidemiology and Health Statistics, School of Public Health, Fujian Medical University, Fuzhou, China (Xue)
| | - Yong-Jing Wang
- From the Clinical Laboratory Center, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China (Xue, Wang, W. Li, Q.L. Li, Xu, Niu, Liu)
| | - Wei Li
- From the Clinical Laboratory Center, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China (Xue, Wang, W. Li, Q.L. Li, Xu, Niu, Liu)
| | - Qiu-Ling Li
- From the Clinical Laboratory Center, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China (Xue, Wang, W. Li, Q.L. Li, Xu, Niu, Liu)
| | - Qiu-Yan Xu
- From the Clinical Laboratory Center, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China (Xue, Wang, W. Li, Q.L. Li, Xu, Niu, Liu)
| | - Jian-Jun Niu
- From the Clinical Laboratory Center, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China (Xue, Wang, W. Li, Q.L. Li, Xu, Niu, Liu)
| | - Li-Li Liu
- From the Clinical Laboratory Center, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China (Xue, Wang, W. Li, Q.L. Li, Xu, Niu, Liu).,From the Xiamen Clinical Laboratory Quality Control Center, Xiamen, China (Liu)
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Ma J, Cheng ZJ, Xue M, Huang H, Li S, Fang Y, Zeng Y, Lin R, Liang Z, Liang H, Deng Y, Cheng Y, Huang S, Wang Q, Niu X, Li S, Zheng P, Sun B. Investigation of Antibody Levels During Three Doses of Sinopharm/BBIBP Vaccine Inoculation. Front Immunol 2022; 13:913732. [PMID: 35812449 PMCID: PMC9256989 DOI: 10.3389/fimmu.2022.913732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 05/18/2022] [Indexed: 11/13/2022] Open
Abstract
Levels of neutralizing antibodies (NAb) after vaccine against coronavirus disease 2019 (COVID-19) can be detected using a variety of methods. A critical challenge is how to apply simple and accurate methods to assess vaccine effect. In a population inoculated with three doses of the inactivated Sinopharm/BBIBP vaccine, we assessed the performance of chemiluminescent immunoassay (CLIA) in its implementation to detect severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) specific antibodies, as well as the antibody kinetics of healthcare workers throughout the course of vaccination. The antibody levels of NAb, the receptor-binding-domain (RBD) antibodies and IgG peaked one month after the second and remained at a relatively high level for over three months after the booster injection, while IgM and IgA levels remained consistently low throughout the course of vaccination. The production of high-level neutralizing antibodies is more likely when the inoculation interval between the first two doses is within the range of one to two months, and that between the first and booster dose is within 230 days. CLIA showed excellent consistency and correlation between NAb, RBD, and IgG antibodies with the cytopathic effect (CPE) conventional virus neutralization test (VNT). Receiver operating characteristic (ROC) analysis revealed that the optimal cut-off levels of NAb, RBD and IgG were 61.77 AU/ml, 37.86 AU/ml and 4.64 AU/ml, with sensitivity of 0.833, 0.796 and 0.944, and specificity of 0.768, 0.750 and 0.625, respectively, which can be utilized as reliable indicators of COVID-19 vaccination immunity detection.
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Affiliation(s)
- Jing Ma
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Zhangkai J. Cheng
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Mingshan Xue
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Huimin Huang
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Shiyun Li
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Yanting Fang
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Yifeng Zeng
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Runpei Lin
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Zhiman Liang
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Huan Liang
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Yijun Deng
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Yuanyi Cheng
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Shuangshuang Huang
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Qian Wang
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Xuefeng Niu
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
- *Correspondence: Baoqing Sun, ; Peiyan Zheng, ; Siping Li, ; Xuefeng Niu,
| | - Siping Li
- Clinical Laboratory, Dongguan Eighth People’s Hospital, Dongguan, China
- *Correspondence: Baoqing Sun, ; Peiyan Zheng, ; Siping Li, ; Xuefeng Niu,
| | - Peiyan Zheng
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
- *Correspondence: Baoqing Sun, ; Peiyan Zheng, ; Siping Li, ; Xuefeng Niu,
| | - Baoqing Sun
- Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, National Clinical Research Center of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
- *Correspondence: Baoqing Sun, ; Peiyan Zheng, ; Siping Li, ; Xuefeng Niu,
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9
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Swadźba J, Anyszek T, Panek A, Chojęta A, Wyrzykowska K, Martin E. Head-to-Head Comparison of 5 Anti-SARS-CoV-2 Assays Performance in One Hundred COVID-19 Vaccinees, over an 8-Month Course. Diagnostics (Basel) 2022; 12:1426. [PMID: 35741236 PMCID: PMC9221713 DOI: 10.3390/diagnostics12061426] [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: 05/12/2022] [Revised: 05/31/2022] [Accepted: 06/07/2022] [Indexed: 11/16/2022] Open
Abstract
The immunoassays used to measure anti-spike SARS-CoV-2 antibodies are widely available on the market. However, their performance in COVID-19 vaccinees is not yet adequately assessed. Our study provides a head-to-head comparison of five methods: Abbott's S1-RBD IgG, Roche's S1-RBD total antibody, Euroimmun's S1 IgG, and DiaSorin's TrimericS IgG and S1/S2 IgG assays. Testing was performed in one hundred vaccinated subjects, at eight timepoints over eight months after vaccination. The results differed substantially between methods; however, they correlated strongly and demonstrated the individuals' responses to both doses of vaccination and the waning of humoral immunity after eight months. Importantly, we encountered a high percentage of results above the assay-specific upper quantitation limit (UQL) for undiluted samples. This was the most pronounced for the Roche's and Euroimmun's assays. The Abbott's assay showed the lowest percentage of results above the UQL. We also attempted to find a common way to establish antibody concentrations that might be classified as high. However, this resulted in between 10% and 100% of such results for different methods on day 240'. This highlights the need for an assay-specific approach for adjusting the cut-offs that may indicate COVID-19 immunity.
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Affiliation(s)
- Jakub Swadźba
- Medical Department Diagnostyka S.A., 31-864 Krakow, Poland; (J.S.); (T.A.); (A.P.); (A.C.); (K.W.)
- Department of Laboratory Medicine, Faculty of Medicine and Health Sciences, Andrzej Frycz Modrzewski Krakow University, 30-705 Krakow, Poland
| | - Tomasz Anyszek
- Medical Department Diagnostyka S.A., 31-864 Krakow, Poland; (J.S.); (T.A.); (A.P.); (A.C.); (K.W.)
- Department of Laboratory Medicine, Faculty of Medicine and Health Sciences, Andrzej Frycz Modrzewski Krakow University, 30-705 Krakow, Poland
| | - Andrzej Panek
- Medical Department Diagnostyka S.A., 31-864 Krakow, Poland; (J.S.); (T.A.); (A.P.); (A.C.); (K.W.)
| | - Agnieszka Chojęta
- Medical Department Diagnostyka S.A., 31-864 Krakow, Poland; (J.S.); (T.A.); (A.P.); (A.C.); (K.W.)
| | - Kinga Wyrzykowska
- Medical Department Diagnostyka S.A., 31-864 Krakow, Poland; (J.S.); (T.A.); (A.P.); (A.C.); (K.W.)
| | - Emilia Martin
- Medical Department Diagnostyka S.A., 31-864 Krakow, Poland; (J.S.); (T.A.); (A.P.); (A.C.); (K.W.)
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10
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Ciniselli CM, Lecchi M, Figini M, Melani CC, Daidone MG, Morelli D, Zito E, Apolone G, Verderio P. COVID-19 Vaccination in Health Care Workers in Italy: A Literature Review and a Report from a Comprehensive Cancer Center. Vaccines (Basel) 2022; 10:vaccines10050734. [PMID: 35632490 PMCID: PMC9146113 DOI: 10.3390/vaccines10050734] [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: 03/29/2022] [Revised: 04/28/2022] [Accepted: 05/05/2022] [Indexed: 02/04/2023] Open
Abstract
The coronavirus disease 2019 pandemic still represents a global public health emergency, despite the availability of different types of vaccines that reduced the number of severe cases, the hospitalization rate and mortality. The Italian Vaccine Distribution Plan identified healthcare workers (HCWs) as the top-priority category to receive access to a vaccine and different studies on HCWs have been implemented to clarify the duration and kinetics of antibody response. The aim of this paper is to perform a literature review across a total of 44 studies of the serologic response to COVID-19 vaccines in HCWs in Italy and to report the results obtained in a prospective longitudinal study implemented at the Fondazione IRCCS Istituto Nazionale Tumori (INT) of Milan on 1565 HCWs. At INT we found that 99.81% of the HCWs developed an antibody response one month after the second dose. About six months after the first serology evaluation, 100% of the HCWs were still positive to the antibody, although we observed a significant decrease in its levels. Overall, our literature review results highlight a robust antibody response in most of the HCWs after the second vaccination dose. These figures are also confirmed in our institutional setting seven months after the completion of the cycle of second doses of vaccination.
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Affiliation(s)
- Chiara Maura Ciniselli
- Bioinformatics and Biostatistics Unit, Department of Applied Research and Technological Development, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy; (C.M.C.); (M.L.)
| | - Mara Lecchi
- Bioinformatics and Biostatistics Unit, Department of Applied Research and Technological Development, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy; (C.M.C.); (M.L.)
| | - Mariangela Figini
- Biomarker Unit, Department of Applied Research and Technological Development, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy;
| | - Cecilia C. Melani
- Scientific Directorate, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy; (C.C.M.); (M.G.D.); (G.A.)
| | - Maria Grazia Daidone
- Scientific Directorate, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy; (C.C.M.); (M.G.D.); (G.A.)
| | - Daniele Morelli
- Laboratory Medicine, Department of Pathology, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy;
| | - Emanuela Zito
- ICT, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy;
| | - Giovanni Apolone
- Scientific Directorate, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy; (C.C.M.); (M.G.D.); (G.A.)
| | - Paolo Verderio
- Bioinformatics and Biostatistics Unit, Department of Applied Research and Technological Development, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy; (C.M.C.); (M.L.)
- Correspondence:
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11
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Padoan A, Cosma C, Della Rocca F, Barbaro F, Santarossa C, Dall'Olmo L, Galla L, Cattelan A, Cianci V, Basso D, Plebani M. A cohort analysis of SARS-CoV-2 anti-spike protein receptor binding domain (RBD) IgG levels and neutralizing antibodies in fully vaccinated healthcare workers. Clin Chem Lab Med 2022; 60:1110-1115. [PMID: 35473824 DOI: 10.1515/cclm-2022-0322] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Accepted: 04/13/2022] [Indexed: 01/01/2023]
Abstract
OBJECTIVES The waning of humoral immunity after COVID-19 vaccine booster (third dose) has not yet been fully evaluated. This study updates data on anti-SARS-CoV-2 spike protein receptor binding domain (S-RBD) binding antibodies (bAb) and neutralizing antibodies (NAb) levels in individuals with homologous vaccination 3-4 months after receiving the booster dose. METHODS Fifty-five healthcare workers (HCW) from Padova University-Hospital were asked to collect serum samples for determining antibodies (Ab) at 12 (t12) and 28 (t28) days, at 6 months (t6m) after their first Comirnaty/BNT162b2 inoculation, and 3-4 months after receiving the 3rd homologous booster dose. HCW were monitored weekly for SARS-CoV-2 infection. Ab titers were measured by two chemiluminescent immunoassays, one targeting the S-RBD immunoglobulin G (IgG), and one surrogate viral neutralization test (sVNT), measuring NAb. RESULTS Twenty of the HCW had natural COVID-19 infection (COVID+) at different times, before either the first or the second vaccination. Median S-RBD IgG and NAb levels and their interquartile ranges 3-4 months after the 3rd dose were 1,076 (529-3,409) kBAU/L and 15.8 (11.3-38.3) mg/L, respectively, for COVID-, and 1,373 (700-1,373) kBAU/L and 21 (12.8-53.9) mg/L, respectively, for COVID+. At multivariate regression analyses, with age and gender included as covariates, S-RBD IgG bAb and sVNT NAb levels were closely associated with the time interval between serological determination and the 3rd vaccine dose (log10 _coeff=-0.013, p=0.012 and log10 _coeff=-0.010, p=0.025) for COVID+, whereas no such association was found in COVID- individuals. CONCLUSIONS The third booster dose increases anti-SARS-CoV-2 Ab levels, elevated levels persisting for up to 3-4 months. Waning of Ab levels appears to be less pronounced for COVID+ individuals.
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Affiliation(s)
- Andrea Padoan
- Department of Medicine - DIMED, University of Padova, Padova, Italy.,Department of Laboratory Medicine, University-Hospital of Padova, Padova, Italy
| | - Chiara Cosma
- Department of Laboratory Medicine, University-Hospital of Padova, Padova, Italy
| | | | - Francesco Barbaro
- Unit of Infectious and Tropical Diseases, University-Hospital of Padova, Padova, Italy
| | | | - Luigi Dall'Olmo
- Department of Surgical Oncological and Gastroenterological Sciences - DISCOG, University of Padova, Padova, Italy.,Veneto Institute of Oncology, IOV-IRCCS, Padova, Italy
| | - Luisa Galla
- Department of Laboratory Medicine, University-Hospital of Padova, Padova, Italy
| | - Annamaria Cattelan
- Unit of Infectious and Tropical Diseases, University-Hospital of Padova, Padova, Italy
| | - Vito Cianci
- Unit of Infectious and Tropical Diseases, University-Hospital of Padova, Padova, Italy
| | - Daniela Basso
- Department of Medicine - DIMED, University of Padova, Padova, Italy.,Department of Laboratory Medicine, University-Hospital of Padova, Padova, Italy
| | - Mario Plebani
- Department of Medicine - DIMED, University of Padova, Padova, Italy.,Department of Laboratory Medicine, University-Hospital of Padova, Padova, Italy
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12
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Lippi G, Salvagno GL, Henry BM, Pighi L, De Nitto S, Gianfilippi G. Comparative longitudinal variation of total IgG and IgA anti-SARS-CoV-2 antibodies in recipients of BNT162b2 vaccination. ADVANCES IN LABORATORY MEDICINE 2022; 3:39-50. [PMID: 37359438 PMCID: PMC10270242 DOI: 10.1515/almed-2021-0086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 12/04/2021] [Indexed: 06/28/2023]
Abstract
Objectives This article aims to summarize the 6-month variation of a vast array of anti-SARS-CoV-2 antibodies in recipients of BNT162b2 mRNA-based vaccination. Methods The study population consisted of 84 baseline SARS-CoV-2 seronegative healthcare employees (median age 45 years, 53.6% females), receiving mRNA-based BNT162b2 primary vaccination cycle. Blood was collected before the first and second BNT162b2 vaccine doses, as well as 1, 3 and 6 months afterwards. The serum titers of the following anti-SARS-CoV-2 antibodies were assayed: total anti-RBD (receptor binding domain), anti-spike trimeric IgG, anti-RBD IgG and anti-spike S1 IgA. Results All antibodies' levels peaked 1 month after vaccination, but then displayed a considerable decrease. The median rates of 6-month decline were -95% for IgG anti-SARS-CoV-2 RBD, -85% for IgG anti-SARS-CoV-2 trimeric spike, -73% for IgA anti-SARS-CoV-2 S1 and -56% for total anti-SARS-CoV-2 RBD antibodies, respectively. The median time of seronegativization was estimated at 579 days for total anti-SARS-CoV-2 RBD antibodies, 271 days for IgG anti-SARS-CoV-2 trimeric spike, 264 days for IgG anti-SARS-CoV-2 RBD and 208 days for IgA anti-SARS-CoV-2 S1, respectively. The rate of seropositive subjects declined from 98-100% at the peak to 50-100% after 6 months. The inter-individual variation of anti-SARS-CoV-2 antibodies reduction at 6 months was 3-44% from the peak. Conclusions The results of this longitudinal serosurvey demonstrate that the titer of anti-SARS-CoV-2 antibodies declined 6 months after BNT162b2 vaccination, with median time of IgG/IgA seronegativization estimated between 7 and 9 months, thus supporting the opportunity of administering vaccine boosters approximately 5 to 6 months after the last dose of the primary vaccination cycle.
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Affiliation(s)
- Giuseppe Lippi
- Section of Clinical Biochemistry, University of Verona, Verona, Italy
| | - Gian Luca Salvagno
- Section of Clinical Biochemistry, University of Verona, Verona, Italy
- Service of Laboratory Medicine, Pederzoli Hospital, Peschiera del Garda, Italy
| | - Brandon M. Henry
- Clinical Laboratory, Division of Nephrology and Hypertension, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
- Disease Intervention & Prevention and Population Health Programs, Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Laura Pighi
- Section of Clinical Biochemistry, University of Verona, Verona, Italy
- Service of Laboratory Medicine, Pederzoli Hospital, Peschiera del Garda, Italy
| | - Simone De Nitto
- Section of Clinical Biochemistry, University of Verona, Verona, Italy
- Service of Laboratory Medicine, Pederzoli Hospital, Peschiera del Garda, Italy
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13
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Padoan A, Cosma C, Galla L, Basso D, Plebani M. Two rapid SARS-CoV-2 disposable devices for semi-quantitative S-RBD antibody levels determination compared with CLIA and ELISA assays at different protective thresholds. Clin Chim Acta 2022; 529:104-108. [PMID: 35202620 PMCID: PMC8858771 DOI: 10.1016/j.cca.2022.02.014] [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: 02/09/2022] [Revised: 02/17/2022] [Accepted: 02/17/2022] [Indexed: 11/17/2022]
Abstract
BACKGROUND AND AIMS Performance of two disposable devices for identifying subjects with low anti-SARS-CoV-2 protection was compared with that of automated enzyme-linked immunosorbent (ELISA) and chemiluminescent (CLIA) assay. MATERIALS AND METHODS In July 2021, 123 healthcare workers (HCW), twice vaccinated by BNT162b2/Comirnaty mRNA (BioNTech-Pfizer), underwent Ab iRapid COVID-19 Quant "Neutralizing" Self-test (iRapid Self-test) and "Neutralizing" Professional-use (iRapid pro) (DIESSE, Diagnostica Senese, Siena, Italy). Simultaneously, serum Ab were determined by Maglumi 2000 plus (anti S-RBD CLIA assay, Snibe Diagnostics, Shenzhen, China) and SARS-CoV-2 "Neutralizing" Ab Chorus ELISA (DIESSE, Siena, Italy). Results were evaluated against two "protective-thresholds", 90 kBAU/L and 506 kBAU/L. RESULTS HCW mean age, 46.2 (±12.6) years; 26 (20.5%), males, 101 (79.5%), females. The mean time interval (and standard deviation) between the first vaccine dose and Ab determination was 129.5 (±36.4) days and was neither gender (p = 0.879) nor age (p = 0.341) related. With Maglumi, 114 (89.7%) and 43 (33.8%) HCW presented Ab ≥ 90 kBAU/L and Ab ≥ 506 kBAU/L, respectively; with Chorus, 96 (75.6%) presented Ab values ≥506 kBAU/L. CLIA and ELISA agreement was 56.7%. At 90 kBAU/L, iRapid self-test and Pro sensitivities were 98.2% (95% CI: 92.7-99.8), specificity 69.2% (95% CI: 38.6-90.9%) and 76.9% (46.2-95%), respectively. At 506 kBAU/L, iRapid sensitivities were 58.1-91.6%, and specificities, 89-96.6%. On evaluating Ab at <4 and ≥4 months, protective titers had decreased. CONCLUSIONS iRapid semi-quantitative devices had very good overall agreements of 95.1% and 95.9% for detecting individuals with low anti-SARS-CoV-2 protection.
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Affiliation(s)
- Andrea Padoan
- Department of Medicine-DIMED, University of Padova, Italy; Department of Laboratory Medicine, University-Hospital of Padova, Italy
| | - Chiara Cosma
- Department of Laboratory Medicine, University-Hospital of Padova, Italy
| | - Luisa Galla
- Department of Laboratory Medicine, University-Hospital of Padova, Italy
| | - Daniela Basso
- Department of Medicine-DIMED, University of Padova, Italy; Department of Laboratory Medicine, University-Hospital of Padova, Italy
| | - Mario Plebani
- Department of Medicine-DIMED, University of Padova, Italy; Department of Laboratory Medicine, University-Hospital of Padova, Italy.
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14
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Malipiero G, Villalta D. Answer to the letter of Lippi & Plebani entitled "Not all SARS-CoV-2 IgG and neutralizing antibody assays are created equal". Clin Chim Acta 2021; 526:21-22. [PMID: 34958754 PMCID: PMC8709731 DOI: 10.1016/j.cca.2021.12.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 12/21/2021] [Indexed: 12/03/2022]
Affiliation(s)
- Giacomo Malipiero
- Immunologia e Allergologia, Ospedale Santa Maria degli Angeli, Pordenone, Italy
| | - Danilo Villalta
- Immunologia e Allergologia, Ospedale Santa Maria degli Angeli, Pordenone, Italy.
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15
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Lippi G, Plebani M. Not all SARS-CoV-2 IgG and neutralizing antibody assays are created equal. Clin Chim Acta 2021; 526:81-82. [PMID: 34958752 PMCID: PMC8702590 DOI: 10.1016/j.cca.2021.12.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 12/21/2021] [Indexed: 12/22/2022]
Affiliation(s)
- Giuseppe Lippi
- Section of Clinical Biochemistry and School of Medicine, University of Verona, Verona, Italy.
| | - Mario Plebani
- Department of Laboratory Medicine, Padua University School of Medicine, Padua, Italy
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16
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Padoan A, Cosma C, Bonfante F, Della Rocca F, Barbaro F, Santarossa C, Dall'Olmo L, Pagliari M, Bortolami A, Cattelan A, Cianci V, Basso D, Plebani M. Neutralizing antibody titers six months after Comirnaty vaccination: kinetics and comparison with SARS-CoV-2 immunoassays. Clin Chem Lab Med 2021; 60:456-463. [PMID: 34911170 DOI: 10.1515/cclm-2021-1247] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 12/03/2021] [Indexed: 11/15/2022]
Abstract
OBJECTIVES mRNA vaccines, including Comirnaty (BNT162b2 mRNA, BioNTech-Pfizer), elicit high IgG and neutralizing antibody (NAb) responses after the second dose, but the progressive decrease in serum antibodies against SARS-CoV-2 following vaccination have raised questions concerning long-term immunity, decreased antibody levels being associated with breakthrough infections after vaccination, prompting the consideration of booster doses. METHODS A total number of 189 Padua University-Hospital healthcare workers (HCW) who had received a second vaccine dose were asked to collect serum samples for determining Ab at 12 (t12) and 28 (t28) days, and 6 months (t6m) after their first Comirnaty/BNT162b2 inoculation. Ab titers were measured with plaque reduction neutralization test (PRNT), and three chemiluminescent immunoassays, targeting the receptor binding domain (RBD), the trimeric Spike protein (trimeric-S), and surrogate viral neutralization tests (sVNT). RESULTS The median percentages (interquartile range) for decrease in antibodies values 6 months after the first dose were 86.8% (67.1-92.8%) for S-RBD IgG, 82% (58.6-89.3%) for trimeric-S, 70.4% (34.5-86.4%) for VNT-Nab, 75% (50-87.5%) for PRNT50 and 75% (50-93.7%) for PRNT90. At 6 months, neither PRNT titers nor VNT-Nab and S-RBD IgG bAb levels correlated with age (p=0.078) or gender (p=0.938), while they were correlated with previous infection (p<0.001). CONCLUSIONS After 6 months, a method-independent reduction of around 90% in anti-SARS-CoV-2 antibodies was detected, while no significant differences were found between values of males and females aged between 24 and 65 years without compromised health status. Further efforts to improve analytical harmonization and standardization are needed.
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Affiliation(s)
- Andrea Padoan
- Department of Medicine-DIMED, University of Padova, Padova, Italy.,Department of Laboratory Medicine, University-Hospital of Padova, Padova, Italy
| | - Chiara Cosma
- Department of Laboratory Medicine, University-Hospital of Padova, Padova, Italy
| | - Francesco Bonfante
- Laboratory of Experimental Animal Models, Division of Comparative Biomedical Sciences, Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, Italy
| | | | - Francesco Barbaro
- Infective and Tropical Disease Unit, Padua University Hospital, Padova, Italy
| | | | - Luigi Dall'Olmo
- Department of Surgical Oncological and Gastroenterological Sciences - DISCOG, University of Padova, Padova, Italy.,Veneto Institute of Oncology, IOV-IRCCS, Padova, Italy
| | - Matteo Pagliari
- Laboratory of Experimental Animal Models, Division of Comparative Biomedical Sciences, Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, Italy
| | - Alessio Bortolami
- Laboratory of Experimental Animal Models, Division of Comparative Biomedical Sciences, Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, Italy
| | - Annamaria Cattelan
- Infective and Tropical Disease Unit, Padua University Hospital, Padova, Italy
| | - Vito Cianci
- Emergency Department, Padua University Hospital, Padova, Italy
| | - Daniela Basso
- Department of Medicine-DIMED, University of Padova, Padova, Italy.,Department of Laboratory Medicine, University-Hospital of Padova, Padova, Italy
| | - Mario Plebani
- Department of Medicine-DIMED, University of Padova, Padova, Italy.,Department of Laboratory Medicine, University-Hospital of Padova, Padova, Italy
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