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Specific DNA probes were used to identify Shiga-like toxin I (SLT I)- and SLT II-producing Escherichia coli in vegetables, meats, cattle, and farm animals in Thailand. SLT-producing E. coli was isolated from 9% of market beef specimens, from 8 to 28% of fresh beef specimens at slaughterhouses, and from 11 to 84% of fecal specimens from cattle. Animals were frequently infected with several different SLT-producing E. coli types that hybridized with either the SLT I, SLT II, or both SLT probes. Of 119 SLT-producing E. coli isolates, 24% hybridized with the SLT I probe, 31% hybridized with the SLT II probe, and 44% hybridized with both SLT probes. The enterohemorrhagic E. coli plasmid probe hybridized with 64% (68 of 106) of SLT-producing E. coli isolates from food and cattle and with 8% (17 of 201) of E. coli isolates from pigs. No SLT-producing E. coli was detected in pigs. Seventy-six percent (26 of 34) of E. coli isolates that hybridized with the SLT II probe were cytotoxic to Vero but not to HeLa cells, suggesting that they produced the variant of SLT II. The high prevalence of SLT-producing E. coli in beef-producing animals suggests that exposure to animals and eating beef may pose a health risk for acquiring enterohemorrhagic E. coli infections in Thailand.

Shiga-like-toxin-producing Escherichia coli in retail meats and cattle in Thailand