The Thai Journal of Veterinary Medicine


In January 2010, we examined the prevalence of Salmonella in the rectal swab of 66 swine on 8 farms and in 25 pork products at 6 meat retailers of Sa Kaew province. Salmonella was isolated from 3%(2/66) of swine rectal swab samples and 96%(24/25) of pork samples. In rectal swab samples, both S. Weltevreden and S. Dumfries were isolated from one sample, and S. Stanley from another sample. In pork, a total of 42 isolates (16 serovars) were found ; 8 strains of S. Rissen, 5 strains of S. Stanley and S. Anatum, 4 strains of S. Give and S. Kedougou, 3 strains of S. Welteverden, 2 strains of S. Hvittingfoss, S. Agona and S. Krefeld, and only 1 strain of 7 serovars were isolated. The resistance of Salmonella isolates was highest for tetracycline (69%), followed by ampicillin (50%), sulfamethoxazoletrimethoprim (36%), streptomycin (31%), chloramphenicol (14%), cefotaxime (5%), and ciprofloxacin (2%). S. Stanley and S. Weltevreden were found in both rectal swab and pork samples; however, pulsed-field gel electrophoresis and resistance profiles revealed no relationship between the rectal swab and pork isolates. In our study, Salmonella was isolated from only 3% of swine rectal swab samples, however, pork at a meat retailer in Sa Kaew province had a high prevalence of Salmonella. The result suggested that cross contamination may occur during slaughter house, transportation, to retail shop.

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