We tested by the Sereny method and examined for plasmids 14 previously Sereny-test-positive and 17 previously untested Escherichia coli strains. The presence of a 140-megadalton plasmid was significantly associated with enteroin-vasiveness as measured by the Sereny test in the 31 E. coli strains examined.
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Harris et al. (1982) studied this question.
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