This prospective observational study was performed using sera collected in February 2021 from 69 individuals without a previous SARS-CoV-2 infection in the course of a workplace vaccination campaign in the metropolitan area of Vienna, Austria. The samples were taken 21 ± 1 days (mean ± standard deviation) after the first dose of the Pfizer/BioNTech BNT162b2 vaccine. We included vaccinated persons rather than individuals with a history of SARS-CoV-2 infection, in order to be able to compare test systems following a more or less standardized stimulus. Further inclusion criteria were an age of >18 years, whereas an insufficient amount of serum resulted in exclusion from the study. The study protocol was reviewed and approved by the Ethics Committee of the Medical University of Vienna (EK1066/2021). All participants provided written informed consent to donate blood for the evaluation of diagnostic test systems (EK404/2012). The studied complied with the World Medical Association Declaration of Helsinki regarding ethical conduct of research involving human subjects.
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