The distribution of serotypes ofEscherichia coliin cow-pats and other animal material compared with serotypes ofE. coliisolated from human sources

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Abstract
The serotypes of 13,139 strains of E. coli isolated from humans were compared with the serotypes of 1076 strains isolated from animals. Of these strains, 689 were isolated from fresh cow-pats on 22 sites in England and Wales and 708 O/H [antigen] combinations were found. Of these, 520 were found in human strains only, 130 from animal strains only and 58 O/H serotypes from humans and animals. About 1/2 of the animal strains could not be typed with the full set of sera used.