Evaluation of salmonella and Shiga toxin-producing Escherichia coli isolated from pet food and antimicrobial susceptibility patterns



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Foods can be contaminated with food-borne pathogens and pet foods are not exempt. In the United States, there has been recalls and outbreaks related to contamination of pet food by Salmonella, and Shiga toxin-producing Escherichia coli (STEC). In this study, 195 samples including 107 processed and 88 raw pet food samples were tested for the presence of Salmonella and Shiga toxin-producing Escherichia coli. This study showed the presence of Salmonella in pet food samples to be 2.56% (5 of 195) samples tested, with raw pet food responsible for all presence of Salmonella with 5.68% (5 of 88 samples). Also, only 1.02% samples (2 of 195) tested positive for the presence of Shiga toxin-producing Escherichia coli serotype O26, and both samples were raw pet food (2 of 88) making the presence in raw pet food 2.27%. The Salmonella and STEC isolates were subjected to antimicrobial testing. A total of 16 of the 36 Salmonella isolates were resistant to at least one antibiotic. Only 1 of the 4 isolated STEC (isolated from 2 samples) was resistant to at least one form of antibiotic. This study showed that raw pet food could become a public health concern if not properly handled.



Pet food, Pathogens