coronavirus 2 (SARS-CoV-2), but being seronegative is observed in 1 to 9%. We aimed to
investigate the risk factors associated with being seronegative following PCR-confirmed
SARS-CoV-2 infection. In a prospective cohort study, we screened health care workers
(HCW) in the Capital Region of Denmark for SARS-CoV-2 antibodies. We performed three
rounds of screening from April to October 2020 using an enzyme-linked immunosorbent …