TABLE 1.

Prevalence of the four major E. coli phylogenetic groups in fecal samples from different human populations^a

Population	No. of samples	Prevalence (%) of phylogenetic group:
		A	B1	B2	D
French people
Paris area residents Ib	56	61.0	12.5	10.5	16.0
Paris area residents IIc	27	29.6	11.1	37.1	22.2
Brittany (BIW)e residents	25	24.0	24.0	32.0	20.0
Brittany (PF)f residents	25	32.0	28.0	16.0	24.0
Brest University students	21	14.3	23.8	33.3	28.6
Tours residents	24	25.0	21.0	29.0	25.0
Michigan residents	88	20.5	12.5	47.7	19.3
Tokyo, Japan, residents	61	28.0	0.0	44.0	28.0
Bogota, Colombia, residents	28	57.1	3.6	14.3	25.0
Cotonou residents	46	50.0	32.6	17.4	0.0
Guyana Amerindians	93	63.4	20.4	3.2	12.9
Malian people	55	23.6	58.2	1.8	16.4
Croatian people	57	35.1	31.6	19.3	14.0
Australian people	266	19.5	12.4	45.1	22.9
Korean people	141	29.8	34.0	0.0	36.2
Chinese peopled	325	43.7	23.4	16.0	16.9

^aData from studies by Duriez et al. (3), Escobar-Paramo et al. (4), Gordon et al. (6), and Unno et al. (18) and from this study.

^bData from study by Duriez et al. (3).

^cData from study by Escobar-Paramo et al. (4).

^dData from this study.

^eBIW, bank and insurance workers.

^fPF, pig farmers.