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- Title
TOTAL ANTI-SARS-COV-2 ANTIBODIES MEASURED 6 MONTHS AFTER PFIZER-BIONTECH COVID-19 VACCINATION IN HEALTHCARE WORKERS.
- Authors
Salvagno, Gian Luca; Henry, Brandon M.; Pighi, Laura; De Nitto, Simone; Lippi, Giuseppe
- Abstract
Background: This study aimed at monitoring the kinetics of serum total anti-SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) antibodies in a cohort of healthcare workers after voluntary vaccination with Pfizer-BioNTech coronavirus disease 2019 (COVID-19) mRNA-based vaccine. Methods: The study population consisted of 787 healthcare workers (mean age 44±12 years; 66% females), who received two 30 pg doses of Pfizer-BioNTech COVID-19 vaccine, 3 weeks apart. Venous blood was drawn before the first vaccine dose, immediately before the second vaccine dose, and then at 1, 3 and 6 months after the second vaccine dose. Serological testing employed the total anti-SARS-CoV-2 antibodies measurement with Roche Elecsys Anti-SARS-CoV-2 S chemiluminescent immunoassay. Results: The median serum levels of total anti-SARS-CoV-2 antibodies reached the peak (1762 kU/L) 1 month after the second vaccine dose, but tended to progressively decline at the 3-month (1086 kU/L) and 6-month (802 kU/L) follow-up points. Overall, the values after 3-and 6months were 37% and 57% lower than the corresponding concentrations measured at the peak. No healthcare worker had total anti-SARS-CoV-2 antibodies below the method-dependent cut-off after 6 months. The decline compared to the peak was more accentuated in baseline seropositive persons than in those who were baseline seronegative (74% vs. 52%) cohort. The 6-month post-vaccination anti-SARS-CoV-2 antibodies in subjects aged <65 years remained over 2-fold higher than in those aged >65 years (813 vs. 343 kU/L) and also remained consistently higher in women than in men. Conclusions: Gradual decline of total anti-SARS-CoV-2 antibodies occurred 6 months after Pfizer-BioNTech COVID-19 vaccination, though values remained higher than the method-dependent cut-off, with no case of sero-negativization.
- Subjects
SARS-CoV-2; MEDICAL personnel; COVID-19 vaccines; COVID-19
- Publication
Journal of Medical Biochemistry, 2022, Vol 41, Issue 2, p199
- ISSN
1452-8258
- Publication type
Article
- DOI
10.5937/jomb0-33999