TABLE 2.

RF-IgM-positive serum results of SARS-CoV-2 IgM detected using GICA and ELISA^a

Patient no.	RF-IgM (IU/ml)	GICA	ELISA
1	34.2	N	N
2	35.5	N	N
3	39.8	N	N
4	56.2	N	N
5	56.3	N	N
6	66.5	N	N
7	69.2	N	N
8	73.6	N	N
9	74.2	P	P
10	76.2	P	P
11	82.8	P	P
12	84.0	N	N
13	98.80	N	N
14	118.0	P	P
15	119	P	P
16	142	P	P
17	145	P	P
18	154	P	P
19	161	P	P
20	173	P	P
21	173	P	P
22	195	N	N
23	220	N	N
24	222	P	P
25	224	P	P
26	256	P	P
27	283	P	P
28	284	N	N
29	328	P	P
30	431	P	P
31	440	P	P
32	441	N	N
33	502	P	P
34	1,050	P	P
35	1,680	P	P
36	1,680	P	P

^aN, negative; P, positive.