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. 2000 Nov;66(11):4926–4934. doi: 10.1128/aem.66.11.4926-4934.2000

TABLE 2.

Infectious dose of in vitro-grown E. coli O157:H7 in sheep

Strain Time p.i. No. of animals positive/no. inoculated at a STEC dosea of:
105 CFUa 104 CFU
86-24 Initial 4/6 2/6
2 wk 2/6 0/6
2 mo 1/6 0/6
3081 Initial 2/6 0/6
2 wk 0/6 0/6
2 mo 0/6 0/6
2041 Initial 6/6 6/6
2 wk 6/6 3/6
2 mo 2/6 0/6
637 Initial 6/6 4/6
2 wk 2/6 1/6
2 mo 0/6 0/6
E2348/69 Initial 6/6 5/6
2 wk 0/6 3/6
2 mo 0/6 0/6
a

STEC 86-24 and 3081 were inoculated at 105 or 104 CFU/strain/animal, and ETEC 2041, ETEC 637, and EPEC E2348/69 were inoculated at 1010 CFU/strain/animal.