TABLE 5.

Detection of IgG and IgM responses to NV^a in outbreak group II by rNV ELISA

Group and patient no.	Time post- exposure	Reciprocal of serum dilution
		IgG	IgM
IIa
1b	5–8 days	25,600	<25
	3 wk	204,800	3,200
2	5–8 days	12,800	800
	3 wk	204,000	800
3	5–8 days	12,800	<25
	3 wk	204,800	6,400
4b	5–8 days	51,200	6,400
	3 wk	409,600	6,400
5	5–8 days	6,400	25
	3 wk	51,200	800
6	5–8 days	12,800	<25
	3 wk	25,600	25
7	5–8 days	6,400	<25
	3 wk	51,200	<25
8	5–8 days	102,400	3,200
	3 wk	409,600	6,400
9b	5–8 days	25,600	800
	3 wk	409,600	3,200
10	5–8 days	25,600	<25
	3 wk	409,600	3,200
11	5–8 days	12,800	<25
	3 wk	102,400	25
12	5–8 days	25,600	<25
	3 wk	51,200	800
13	5–8 days	1,600	<25
	3 wk	102,400	3,200
14	5–8 days	51,200	3,200
	3 wk	1,638,400	3,200
15	5–8 days	6,400	<25
	3 wk	102,400	25
16	5–8 days	25,600	<25
	3 wk	51,200	25
IIb
1	4 days	12,800	<25
	2 wk	204,800	800
2	4 days	12,800	<25
	2 wk	51,200	<25
3	4 days	6,400	<25
	2 wk	51,200	400
4	4 days	6,400	<25
	2 wk	25,600	50
5b	4 days	6,400	<25
	2 wk	51,200	800
6b	4 days	25,600	<25
	2 wk	102,400	<25
7	4 days	3,200	<25
	2 wk	51,200	<25
8	4 days	12,800	<25
	2 wk	51,200	<25

^aSamples were from patients involved in two outbreaks of gastroenteritis in Erie County, N.Y., in 1986 that were reported to be due to NV (8). Sera were collected at the noted intervals postexposure to the virus, in contrast to those in Tables 2 and 3. 

^bThe virus in this patient’s stool sample was analyzed for genogroup (see Fig. 1).