Heat-labile toxin (LT) genes from human and animal Escherichia coli isolates from a restricted geographical region (Thailand) exhibited a segregated pattern of dissemination that was revealed by a restriction enzyme site polymorphism. The results suggest an exclusion of LT genes from or a low transfer rate for LT genes between E. coli strains infectious for humans and those infectious for animals in natural settings.
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Vinal et al. (1987) studied this question.
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