SEROTYPES OF CNF1-PRODUCING ESCHERICHIA-COLI STRAINS THAT CAUSE EXTRAINTESTINAL INFECTIONS IN HUMANS

The O:K:H serotypes of 137 necrotoxigenic Escherichia coli (NTEC) prod ucing the cytotoxic necrotizing factor type 1 (CNF1) isolated from hum an extraintestinal infection were determined. Although NTEC producing CNF1 belonged to 58 different serotypes, only 10 of them accounted for 54% of strains. The most common serotypes, in order of frequency, wer e: O4:K?:H5, O6:K13:H1, O83:K1:H31, O75:K95:H5, O2:K1:H6, O2:K7:H-, O7 5:K1:H7, O2:K?:H1, O4:K12:H1 and O22:K13:H1. CNF1 strains of serotypes O2:K7:Hand O4:K12:H1 express P-fimbriae, whereas CNF1 strains of sero types O2:K?:H1, O2:K1:H6 and O75:K95:H5 possess the adhesin responsibl e for MRHA type III. Among CNF1 strains of serotype O4:K?:H5 there exi st some that express P-fimbriae and others that possess MRHA type III. Lastly, the majority of CNF1 strains of serotypes O6:K13:H1, O22:K13: H1, O75:K1:H7 and O83:K1:H31 do not express P-fimbriae nor the adhesin responsible to MRHA type III. Our results show that extraintestinal i nfections are caused by a limited number of virulent clones, as sugges ted by the theory of special pathogenicity.