Journal
CLINICAL LABORATORY
Volume 66, Issue 10, Pages 2133-2137Publisher
CLIN LAB PUBL
DOI: 10.7754/Clin.Lab.2020.200915
Keywords
SARS-CoV-2; COVID-19; blood donor; serology
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Background: Coronavirus disease-2019 (COVID-19) is a respiratory infection caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). While RT-PCR assays are used routinely to diagnose active COVID-19, serological testing offers a means of identifying individuals who previously experienced asymptomatic infections, as well as those who experienced symptomatic infections but no longer carry the virus. Methods: The presence of SARS-CoV-2 IgG-positive antibodies in the sera of 673 blood donors residing in southwestern Germany before and 3,880 donors after the advent of the COVID-19 pandemic was determined and confirmed using two highly sensitive serological tests. Results: Approximately 0.40% of the donors assessed during the COVID-19 pandemic possessed SARS-CoV-2 IgG-positive antibodies, decidedly fewer than the percentage of SARS-CoV-2-infected individuals determined by real-time RT-PCR nationwide. Conclusions: These findings confirm the efficacy serological testing in identifying asymptomatic COVID-19 patients.
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