Table 1.

SARS-CoV-2 IgM/IgG antibodies detected using rapid serological tests and ELISA.

Sample ID	Rapid test		ELISA		RF (IU/mL)
	IgM	IgG	IgM	IgG
Sample 1	+	+	–	–	<10
Sample 2	+	+	–	–	294
Sample 3	+	–	–	–	<10
Sample 4	+	–	+	–	<10
Sample 5	+	–	+	–	<10
Sample 6	+	–	–	–	18.5
Sample 7	+	–	–	–	<10
Sample 8	+	–	–	–	<10
Sample 9	+	–	–	–	<10
Sample 10	+	–	–	+	29.8
Sample 11	+	+	+	–	>600
Sample 12	+	–	–	–	<10
Sample 13	+	–	+	–	<10
Sample 14	+	–	–	–	<10
Sample 15	–	+	–	+	<10
Sample 16	–	+	–	–	<10
Sample 17	+	+	–	+	15.8
Sample 18	–	+	–	–	<10
Sample 19	+	–	–	–	<10
Sample 20	+	+	–	–	<10
Sample 21	–	+	–	–	<10
Positive control 1	–	+	–	+	<10
Positive control 2	–	+	–	+	<10
Positive control 3	–	+	–	+	<10
Positive control 4	–	+	–	+	<10
Positive control 5	+	+	+	+	<10
Positive control 6	+	+	–	+	<10
Positive control 7	+	+	+	+	<10
Positive control 8	–	+	–	+	<10
Positive control 9	–	+	–	+	<10
Negative control 1	–	–	–	–	<10
Negative control 2	–	–	–	–	<10
Negative control 3	–	–	–	–	<10
Negative control 4	–	–	–	–	<10
Negative control 5	–	–	–	–	<10
Negative control 6	–	–	–	–	<10

Abbreviations: RF: rheumatoid factor; IgM: Immunoglobulin M; IgG: Immunoglobulin G.