Seasonal effect on Salmonella, Shiga toxin-producing E. coli O157:H7 and non-O157 in the beef industry in Colombia, South America

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Abstract

This research investigated the variations in the occurrence of Salmonella, STEC O157:H7 and non-O157 in the beef production chain in Colombia affected by seasons, hypothesizing that pathogen prevalence will be highest in the rainy season owing to soil moisture promoting bacteria multiplication and transfer between animals. To test this hypothesis, samples were obtained from five abattoirs, which represent 50% of the beef production in this country. A total of 1017 samples were collected, from which 606 were bovine feces, 206 were hide swabs, and 205 corresponded to carcass post-intervention. From the 1017 samples, 49.9% (n=507) were collected during dry season, while 50.1% (n=510) during rainy season. All samples (n=1017) underwent screening for E. coli O157:H7 and Salmonella, while only a proportion of fecal samples (n=339) were screened for the big six STEC serogroups and their virulence markers. The effect of season, age of animal and sex of animal were correla
Original languageEnglish
JournalHeliyon
DOIs
StatePublished - Jul 9 2021

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