TABLE 1.

Summary of clinical data

Group and patient no.	Age (yr)	Sexa	Clinical symptomsb	Antibody response to lipopolysaccharide antigenc
A
1	69	F	HUS	0.45
2	75	F	HUS	0.29
3	6	F	HUS	0.60
4	6	F	HUS	2.30
5	7	M	HUS	0.30
6	7	F	HUS	1.20
7	12	F	HUS	NTd
8	6	M	HUS	0.60
9	6	F	HUS	1.20
10	6	F	HUS	1.40
11	6	F	HUS	2.70
12	7	M	HUS	NT
B
13	20	F	WD	1.12
14	22	F	WD	0.24
15	20	F	WD	NT
16	20	F	WD	0.23
17	18	F	WD	0.83
18	20	F	BD	0.25
19	7	F	BD	NT
20	53	M	BD	NT
21	55	M	BD	NT
22	63	F	BD	NT
23	21	F	BD	0.75
C
24	19	F	Normal	0.09
25	19	F	Normal	0.81
26	20	F	Normal	0.09
27	19	F	Normal	0.08
28	21	F	Normal	0.08
29	21	F	Normal	0.48
30	20	F	Normal	0.63
31	20	F	Normal	0.41
32	20	F	Normal	0.47
33	20	F	Normal	0.07
34	4	F	Normal	NT
35	8	M	Normal	NT

^aF, female; M, male. 

^bWD, watery diarrhea; BD, bloody diarrhea. 

^cAntibody activity was detected by enzyme-linked immunosorbent assay as absorbance at 492 nm using a 1/200 dilution of serum. 

^dNT, not tested.