2008 Volume 61 Issue 10 Pages 805-809
We conducted an abattoir survey to determine the prevalence of Salmonella from 580 healthy pigs reared on 58 farms in Kagoshima Prefecture, in Japan. Salmonella spp. were detected in 91 (15.6%) of pigs belonging to 27 (46.6%) farms. Salmonella Typhimurium (ST) was isolated from 51 (8.8%) pigs originating from 19 (32.8%) farms. Antimicrobial susceptibility testing involving 51 ST isolates was then performed. Resistance to ampicillin (A), chloramphenicol (C), streptomycin (S), sulphamethoxazole (Su) and tetracycline (T) was detected in six isolates of ST whereas ASSuT resistance pattern was observed in six isolates. Integron-specific regions were detected from five of 12 isolates, implying the presence of class I integrons. Three integron patterns were revealed and four strains carried integrons of 1.0 and 1.2 kb, characteristic of the ST definitive phage type 104 (DT104). We inferred these strains as DT104, since they possessed the florfenicol resistance gene (floR) and DT104 common genes. These findings suggest the existence of DT104 strains among pigs in the prefecture. Conversely, a multidrug resistant non-DT104 strain that is also resistant to Fluoroquinolones was observed, indicating further expansion of the range of drug resistance.