Anti-SARS-CoV-2 serology analyses
Serum anti-SARS-CoV-2 spike-binding and nucleocapsid IgG antibody titers were tested at PPDFormulae to enable conversion from arbitrary units per milliliter (AU)/mL to the WHO international standard (National Institute for Biological Standards and Control [NIBSC] 20/136) binding units (BAU/mL) and ID