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Results of serodiagnostic ELISA tests of blood serum samples from patients with a confirmed diagnosis of COVID-19 hospitalized at various times after the onset of symptoms. (A, C, E) – sample positivity index calculated upon detection of SARS-CoV-2 S-protein NTD, RBD, and RBD-SD1 fragment- and N-protein-specific IgM (A), IgA (C), and IgG (E) antibodies. (B, D, F) – Venn diagrams representing antigen-specificity spectra of IgM (A), IgA (C), and IgG (E) immunoglobulins in samples
