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We detected Ent plasmids in 300 strains of human enterotoxigenic Escherichia coli, but one strain, E. coli 240-3, had neither a small nor a large plasmid and encoded the heat-labile enterotoxin (LTh(240-3)) gene on its chromosome. DNA sequences showed that LTh(240-3) differed by 12 and 14 base pairs from LT (LTh) and LT (LTp) from human H10407 and porcine EWD299 strains, respectively. In deduced precursor toxins, LTh(240-3), LTh and LTp differed from LTh, LTp and LTh(240-3) at nine, eight and eleven positions, respectively. These data suggest that although LTh(240-3) encoded in the chromosome is antigenically similar to LTh, it cannot be grouped with LTh due to differences in its DNA and amino acids sequences.

A unique DNA sequence of human enterotoxigenic Escherichia coli enterotoxin encoded by chromosomal DNA