Table 1.

Assay Manufacturer		Immunoglobulin classes detected				Antigens used
Epitope diagnostics Inc.			IgG			Recombinant full length nucleocapsid protein
Abbott Architect			IgG			Recombinant full length nucleocapsid protein
Euroimmun AG		IgA	IgG			S1-Domain of Spike protein including receptor-binding domain
Vircell S.L.U.			IgG			Recombinant antigens from Spike glycoprotein and nucleocapsid protein
Mikrogen GmbH			IgG			Recombinant full length nucleocapsid protein
in-house ELISA		IgA	IgG	IgM		Full length spike glycoprotein
Genspeed Biotech			IgG			Receptor Binding Domain / Full length spike glycoprotein / Nucleoprotein

Characteristics of different SARS-CoV-2 assays used in this study.