Diversity of antibiotic‐resistant Shiga toxin‐producing Escherichia coli serogroups in foodstuffs of animal origin in northern India (original) (raw)

2018, Journal of Food Safety

This study aimed to determine the diversity of antibiotic‐resistant Shiga toxin‐producing Escherichia coli (STEC) serogroups in 600 foodstuff samples of animal origin in the northern part of India. Of the 158 (26.33%) E. coli isolates that were detected in food samples the ‘O’ antigen‐based serotyping revealed the abundance of serogroups O60, O86, O154, O73, O50, O8, and O68. Overall, 45 (28.4%) E. coli isolates were potentially verotoxin producers as determined by verotoxin assay and confirmed by polymerase chain reaction (PCR), of which 42.2% of the STEC isolates originated from raw beef. Among 45 STEC isolates, 51.1% harbored vt 1 gene whereas 48.9% of the serogroups carried vt 2 gene. Chi‐squared test revealed significant difference (p = .001) in the prevalence of STEC serogroups in different foodstuffs. STEC serogroups showed higher resistance to nalidixic acid (71.7%) followed by ampicillin (66.6%). Multidrug resistance (i.e., resistance to 3 or more antimicrobial classes) was...

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