The objective of this study was to assess the antibiotic resistance pattern in Salmonella strains isolated from sausages and pork cuts processed in the same slaughterhouse in Rio Grande do Sul, Brazil. The agar diffusion method was used to test ten different serovars isolated from sausages (n= 127) or from pork cuts (n=62) against 14 antimicrobial drugs. Resistance to sulphonamide (54.0%), tetracycline (35.4%), streptomycin (31.2%), nalidixic acid (28.0%), sulphametoxazole/trimethoprin (24.9%), neomycin (22.2%), chloramphenicol (22.2%), ampicillin (20.6%), tobramycin (19.6%), cefaclor (14.3%), gentamicin (9.5%), amoxacillin/clavulanic acid (5.8%), amikacin (4.2%) and ciprofloxacin (2.1%) was observed. The multiresistance pattern (resistance against at least four antibiotics) was found in 39% of Salmonella strains. The multiresistance pattern was more common in pork cut isolates (62.9%) than in sausage isolates (27.5%). Strains of S. Bredeney and S. Panama, the two most isolated serovars in this study, showed the highest number of multiresistant strains (39.3% and 42.5%, respectively).
RESUMOSuínos portadores assintomáticos de Salmonella sp. ao abate podem ser fonte de contaminação de carcaças. Posteriormente, a elevada manipulação durante o processamento pode resultar em contaminação cruzada e amplificação do índice de produtos positivos. A partir disso, o presente estudo teve como objetivo determinar a freqüência de isolamento de Salmonella sp. em cortes de pernil originários de lotes de suínos portadores ao abate. Foram coletadas amostras de conteúdo intestinal de suínos (n=48) ao abate e de cortes de pernil (n=99), provenientes dos mesmos lotes de animais. As amostras de cortes de pernil foram analisadas em "pools" de três amostras. As amostras colhidas foram submetidas a protocolo de isolamento e identificação de Salmonella sp. Verificou-se que 50% das amostras de conteúdo intestinal e 55,5% dos "pools" de cortes de pernil foram positivos para Salmonella. Foi encontrada uma grande variedade de sorovares de Salmonella sp., sendo que S. Panama foi o mais prevalente. Os resultados sugerem que a entrada de animais no frigorífico excretando Salmonella sp. contribui para a contaminação do produto final. A diversidade de sorovares e clones encontrados indicam a existência de múltiplas fontes de contaminação, tanto para os animais quanto para o produto final.Descritores: Salmonella, suíno, cortes de pernil. ABSTRACTSalmonella carrier pigs at slaughter may be a source of carcass contamination. Moreover, the extensive manipulation during the cuts processing can result in cross-contaminations and amplification of final products contamination. In this sense, the aim of this study was to evaluate the frequency of Salmonella-positive rump cuts originated from positive slaughter pigs batches. Samples of intestinal contents (n=48) from slaughter pigs and rump cuts (n=99) from the same pig batches were tested for the presence of Salmonella, using an isolation protocol previously described. Rump cuts were analyzed in pools of three samples. Salmonella was isolated from 50% of the intestinal content samples and from 55.5% of the rump cuts pools. A great diversity of serovars was found among the Salmonella isolates, and S. Panama was the most prevalent. The results indicate that pigs excreting Salmonella at slaughter are an important source for rump cuts contamination. The high diversity of serovars and clonal groups found demonstrated the multiple origins of contamination of animals and products.
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