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Chen M.-H.,Hungkuang University | Hwang W.-Z.,National Chung Hsing University | Wang S.-W.,Bureau of Food and Drug Analysis BFDA | Shih Y.-C.,Bureau of Food and Drug Analysis BFDA | Tsen H.-Y.,Hungkuang University
Food Microbiology | Year: 2011

Salmonella Schwarzengrund is one of the causative agents of human salmonellosis and animal infections. High prevalence of multidrug resistant strains of . S. Schwarzengrund from chicken meat has been recently reported in Taiwan. With an attempt to see if such prevalence in chicken meat was due to the recirculation of . S. Schwarzengrund strains in traditional marketplaces, a total of 173 . S. Schwarzengrund strains isolated between 2000 and 2005 from 417 retail chicken meat samples purchased from Taipei, Taiwan were analyzed using pulsed field gel electrophoresis (PFGE) method. For . XbaI and . AvrII digested DNA, a total of 23 and 16 PFGE patterns, respectively, were obtained. When these patterns were combined, a total of 47 subtypes were obtained and the major subtypes were X3A2, X1A2 and X2A1. Since it was found that these major subtypes were repeatedly found for multidrug resistant strains collected from 2000 to 2005, we then collected the chicken meat isolates from central and southern Taiwan in 2006. These strains did not show similar major subtypes as those found in Taipei. Such results might also suggest that the repeated appearance of some major subtypes for . S. Schwarzengrund strains isolated each year in Taipei was due to the recirculation of these strains in retail marketplace during these years. © 2010 Elsevier Ltd.

Chen M.H.,National Chung Hsing University | Wang S.W.,Bureau of Food and Drug Analysis BFDA | Hwang W.Z.,National Chung Hsing University | Tsai S.J.,Bureau of Food and Drug Analysis BFDA | And 3 more authors.
Poultry Science | Year: 2010

Salmonella Schwarzengrund is one of the infective Salmonella serotypes for humans and food animals, such as poultry and swine. Because consumption of foods containing salmonellae due to cross contamination or inadequate cooking may lead to human salmonellosis, in this report, the prevalence of Salmonella Schwarzengrund contamination in chicken meat samples purchased from different traditional marketplaces in Taiwan between 2000 and 2006 was investigated. In addition, 228 Salmonella Schwarzengrund strains isolated from these chicken meat samples and 30 human isolates obtained between 2004 and 2006 were compared for their antimicrobial susceptibility. Results showed that the prevalence of Salmonella Schwarzengrund contamination in raw chicken meat samples was 30.5%. Of all of the Salmonella isolates from chicken meat, Salmonella Schwarzengrund accounted for 39.3%. On the other hand, of the total Salmonella strains isolates from humans between 2004 and 2006, Salmonella Schwarzengrund accounted for 2.8%. All these chicken meat isolates and human isolates were multidrug-resistant and demonstrated high resistance to ampicillin, gentamicin, kanamycin, streptomycin, tetracycline, nalidixic acid, trimethoprim-sulfamethoxazole, and chloramphenicol. For gentamicin and kanamycin, however, the resistance gradually declined. The antibiogram study may indicate the abuse of some antibiotics for both humans and chickens. Also, transmission of Salmonella Schwarzengrund strains between humans and food of animal origin is possible. © 2010 Poultry Science Association Inc.

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