SEROTYPES OF BOVINE ESCHERICHIA-COLI PRODUCING CYTOTOXIC NECROTIZING FACTOR TYPE-2 (CNF2)

The serotypes of 101 faecal bovine necrotoxigenic Escherichia coli (NT EC) producing the cytotoxic necrotizing factor type 2 (CNF2) were dete rmined. Although, NTEC producing CNF2 belonged to 48 different O:K:H s erotypes, only eleven of them accounted for 54% of strains. The most c ommon serotypes in order of frequency were: O123:K-:H16, O3:K-:H21, O8 8:K-:H8, O15:K14:H21, O1:K-:H12, O1:K1:H46, O2:K1:H5, O55:H21, O88:K?: H25, O117:K?H21 and O123:K-:H-. The serotypes of CNF2 NTEC were differ ent from those found in NTEC producing CNF1 and in enterotoxigenic, ve rotoxigenic, enteropathogenic, enteroinvasive and enteroadherent E. co li strains that cause infections in humans and animals.