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Shiga toxin‐producing  Escherichia coli  ( STEC ) strains are food‐borne pathogens of public health concern. Despite ruminants are the most important reservoir,  STEC  human infections have also been attributed to pigs. We examined for the presence of  STEC  in 234 samples of swine caecal content collected during the year 2015 at Italian abattoirs in the framework of the harmonized monitoring of antimicrobial resistance (Decision 2013/652/ EU ). The presence of  stx  genes was detected in 122 (52.1%) samples, which were subsequently subjected to  STEC  isolation and characterization. The analysis of the 66 isolated  STEC  strains showed that the majority of the isolates (74.2%) possessed the  stx2a  gene subtype, in a few cases (16.7%) in combination with  stx2b  or  stx2c . Only 25.8% of isolates possessed the  stx2e  subtype ,  typical of swine‐adapted  STEC . None of the isolates possessed the intimin‐coding  eae  gene and the majority of them did not belong to serogroups commonly associated with human infections. The results of this study suggest that pigs can be considered as potential reservoir of certain  STEC  types.

Detection and isolation of Shiga Toxin‐producing Escherichia coli ( STEC ) strains in caecal samples from pigs at slaughter in Italy