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Analysis of serum antibody titres to SARS-CoV-2 RBD in HCWs. a-c. Shown are the distributions of titres expressed as Relative Units (RU) of serum IgG (a), IgM (b) and IgA (c) in 4726 HCWs, compared to the clinical group of 50 COVID-19 convalescent patients and 191 healthy donors (controls) whose serum was collected before the COVID-19 pandemic. d-e. Analysis of serum IgM (d) and IgA (e) in 454 SARS-CoV-2 RBD-IgG+ HCWs.
