COVID-19 patients
Serum/plasma samples were collected from a total of 99 COVID-19 cases
confirmed to be infected with SARS-CoV-2 by real-time RT-PCR (rRT-PCR)
on samples from the respiratory tract. These samples were provided by
the Biobank of Infectious Diseases (BBEI) of the Institute for
Biomedical Research on Retroviruses and AIDS (INBIRS). Seventy-nine of
these samples were IgG positive and 20 were IgG negative for SARS-CoV-2
by COVIDAR IgG ELISA test
(Laboratorio Lemos S.R.L., Argentina). Sample collection and protocols
were approved by the Ethics Committee of BBEI-INBIRS and the Ethics
Committee in Clinical Research of the School of Pharmacy and
Biochemistry, UBA. All subjects were informed about the purpose of the
study, and they signed consent for study participation. Sera were stored
at -20°C until assayed.