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The aims of the current study were to detect the virulence factors and antibiotic resistance of Shiga toxin-producing  E. coli , in animal milk and dairy products in Iran. After  E. coli  dentification with culture method, PCR assay were developed for detection of pathogenic genes, serotypes and antibiotic resistance genes of  E. coli . Results showed that out of 719 samples, 102 (14.18%) were confirmed to be positive for  E. coli  and out of 102 positive samples, 17.64% were O26 and 13.72% were O157 and 1.96% were O91 and 1.96% were O145 serotypes. Totally, the prevalence of  stx 1 and  papA  genes were the highest while the prevalence of  sfaS  and  fyuA  were the lowest in the positive samples. PCR results showed that  tetA, tetB  were the highest (64.70%) and  aac (3)- IV  were the lowest (27.45%) antibiotic resistant genes in  E. coli  positive samples. Our study indicated that the isolated  E. coli  trains in these regions had a highest antibiotic resistance to tetracycline (58.82%) and the lowest to nitrofurantoin (3.92%).  tetA  gene and  E. coli  O157 serotype had highest and  aac (3)- IV  gene, and  E. coli  O145 serotype had a lowest frequency rates of antibiotics resistance genes, in the region.

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Molecular Characterization of Shiga Toxin-Producing<i>Escherichia coli</i>Isolated from Ruminant and Donkey Raw Milk Samples and Traditional Dairy Products in Iran

Molecular Characterization of Shiga Toxin-ProducingEscherichia coliIsolated from Ruminant and Donkey Raw Milk Samples and Traditional Dairy Products in Iran