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Three species of plasmids, associated with virulence and conjugal transfer, were identified in a clinically isolated enterotoxigenic Escherichia coli strain, H10407 (serotype O78:H11). pCS1, a non-self-transmissible plasmid species with a molecular weight of 62 X 10(6) and a 47 mol% guanine-plus-cytosine content, specified colonization factor antigen I and heat-stable enterotoxin (ST) production, as reported by others previously. A second non-self-transmissible plasmid species, designated pJY11, with a molecular weight of 42 X 10(6) and a 51 mol% guanine-plus-cytosine content, specified ST and heat-labile enterotoxin production and manifested T5/T6 phage restriction. The third plasmid species, pTRA1, also had a molecular weight of 42 X 10(6) and had a guanine-plus-cytosine content of 51 mol%; this species was self-transmissible and promoted transfer of both pCS1 and pJY11 to other bacterial cells. pCS1 may have originated from species of bacteria with a lower guanine-plus-cytosine content than E. coli. Finally, although demonstrating some heterogeneity with each other, both STs encoded by pCS1 and pJY11 belonged to the STa group.

Plasmids of enterotoxigenic Escherichia coli H10407: evidence for two heat-stable enterotoxin genes and a conjugal transfer system