The Thai Journal of Veterinary Medicine


We studied the prevalence of swine salmonellosis and PFGE genotype of isolates in Gunma Prefecture,Japan. Between 2005 and 2008, swine salmonellosis was confirmed in 430 of 2,707,402 (0.02%) swine atslaughterhouses. All isolates were identified as deriving from Salmonella Choleraesuis, biotype Choleraesuis (negativefor H2S production). We used 30 bacterial strains from 15 farms that had experienced outbreaks in 2006 and 2007. Allstrains were susceptible to various antibiotics such as cephems (cefotaxime), fluoroquinolones (norfloxacin andciprofloxacin), and fosfomycin. On the other hand, all strains were resistant to tetracycline (TC), and 29 of 30 (97%)strains were resistant to streptomycin (SM). The most predominant profiles were those of SM-TC (26 strains). DuringBln I digestion, 30 strains showed 6 profiles on PFGE as G1 to G6, and each profile was assigned into 1 of 4 clusters (Ito IV). The most prevalent profile was G1 (22 strains), followed by G3 (3 strains), and G2 (2 strains). Strains showingthe same antimicrobial resistance profiles (SM-TC) and the same PFGE profiles (G1) were isolated from 5 of 15 farms(A to E) during the 2006 and 2007 outbreaks. In conclusion, the prevalence of swine salmonellosis caused by SM-TCresistant-S. Choleraesuis biotype Choleraesuis is around 0.02%, as determined by infection rate at pig farms between2005 and 2008 in Gunma prefecture. S. Choleraesuis usually causes systemic infections in swine and humans andantimicrobial treatment is necessary. The antimicrobial susceptibility of Salmonella in swine should be surveyedfurther.

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