epidemiological survey on escherichia coli o157 in chongqing and three-gorge reservoir areas of china.prevalence, presence of virulence and adherence associated genes, genetic diversity, biochemical characteristics, and antibiotic susceptibility were determined for escherichia coli o157 isolated over 4 months in chongqing city and three-gorge reservoir areas. 11 isolates of e. coli o157 were isolated from 1504 samples and 7 of them are o157:h7 and 4 are o157:h? all o157:h7 isolates had eaea, ehxa, espa and tccp genes, but did not have stx1 and stx2. all o157:h? isolates did not have stx1, stx2, ...200818481192
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