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Criteria of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibody positivity determination. Total 5,284 blood samples of participants were screened using Elecsys Anti-SARS-CoV-2 assay. If the result was positive, five additional antibody tests, including plaque reduction neutralizing test (PRNT), were performed. If one of the five assays was positive, the sample was considered positive for the antibody against SARS-CoV-2.
