TABLE 1.

IgM and IgG reactivity to NRA and SMB antigen in a panel of coded human serum specimens^a

Specimen no. (day postonset)	ELISA titer								Nt antibody titer
	IgM				IgG
	NRA	SMB			NRA	SMB
		NY99 virus	Eg-101 virus	SLE virus		NY99 virus	Eg-101 virus	SLE virus
Positive control	4.19	4.46	5.16		4.54	5.00	4.82		ND
1 (20)	7.42	7.15	6.59	3.74	7.22	6.30	5.12	7.93	1:1,280
2 (14)	4.26	3.12	4.34	1.14	1.14	1.31	1.40	1.8	ND
3 (16)	6.00	5.39	6.18	2.08	1.61	1.85	1.95	2.53	<1:10
4 (30)	3.04	2.23	2.47	1.21	8.48	7.83	6.34	ND	1:160
5 (68)	5.01	5.85	6.28	1.44	1.10	1.14	1.19	1.02	ND
6 (?)	7.30	4.11	3.51	1.11	8.57	8.84	7.76	11.54	1:320
7 (43)	1.90	1.76	2.69	0.79	7.82	7.66	6.40	3.61	ND
8 (20)	1.12	0.98	0.95	0.91	1.53	1.64	1.70	ND	ND
9 (3)	1.53	1.37	2.17	1.13	6.88	7.12	6.07	ND	1:5120
10 (3)	6.43	4.69	6.04	1.87	3.94	4.23	4.38	2.31	<1:10
11 (7)	6.71	4.59	5.78	1.86	3.74	4.30	3.48	2.74	1:20
12 (10)	1.14	1.06	1.17	0.96	6.30	6.59	5.11	7.28	ND
13 (?)	1.13	0.90	1.13	1.33	1.20	1.38	1.41	ND	ND
14 (6)	7.43	6.64	8.03	1.71	7.90	7.05	5.44	4.69	1:80
15 (3)	7.44	6.98	8.32	2.89	2.96	3.04	2.43	2.44	1:160
16 (13)	2.88	2.30	4.17	1.01	1.07	1.37	1.47	1.80	<1:10
17 (4)	1.20	0.85	0.90	1.07	0.94	1.34	1.34	1.49	ND
18 (8)	1.09	0.97	1.01	ND	0.67	0.77	0.75	ND	ND
19 (73)	1.04	0.96	0.95	ND	0.71	0.80	0.79	ND	ND
20 (8)	1.10	1.14	1.01	ND	0.72	0.82	0.82	ND	ND
21 (0)	1.06	0.92	0.88	0.91	0.79	0.88	1.11	0.90	ND
Total no. positive	11	11	13		10	10	10

^aSLE virus MAC and IgG ELISAs were conducted as a separate test. Nt antibody titer was assayed in a 90% plaque reduction neutralization test against WN virus. ND, not done.