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Salmonella spp. is one of the major foodborne pathogen in Europe, being pork meat the second main vehicle of human infection. In this study it was analysed the occurrence of Salmonella spp. on pigs’ skin and in the respective carcasses surfaces (internal and external). For that, matched samples were collected in 120 animals. In each animal, sponge swabs were performed on the skin and in the corresponding carcass surfaces (approximate area 1000 cm). A total of 360 samples were microbiologically analyzed according to ISO 6579. Salmonella isolates (45) were serotype by Kauffmann-White scheme at the National Reference Laboratory for Salmonella in Portugal. The main serotype identified was the monophasic variant of S. Typhimurium: S. 4,[5],12:i:(46.7%), followed by S. Rissen (42.2%) and S. Derby (11.1%). The highest value of Salmonella occurrence was observed in pigs’ skin (29.2%; 35/120) underlining its importance as a potential source of Salmonella contamination to slaughterhouse. Nevertheless, since from these 34 pigs, only 2 presented this bacteria in the respective carcass external surface, the achieved results minimizes its importance for the direct contamination of the respective carcass. Salmonella sp. occurred more in the internal carcass surface (13.3 %; 16/120) than in the external (4.1%; 5/120) and, only in two cases, Salmonella sp. was simultaneously found in both carcass surfaces, equating different contamination sources. Curiously, S. 4,[5],12:i:-, a preoccupant serotype, was only identified in the pigs’ skin (12/34; 35.3%) and in the internal carcass surface (9/16; 56.3%). In these pigs, 4 presented simultaneously this serotype in both matched samples. This study suggest that more attention should be dedicated the skin as an important source of Salmonella contamination and to the internal carcass surface, which analysis is not under mandatory control defined in the Commission Regulation 2073⁄2005.

Salmonella sp. in pigs’ skin, external and internal carcass surface at slaughterhouse