Korean Journal of Veterinary Service (한국동물위생학회지)

The Korean Society of Veterinary Service (한국동물위생학회)
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Serotypes and genotypes of Salmonella isolates from slaughtered pigs

도축돈에서 분리된 살모넬라의 혈청형 및 유전형

  • Choi, Won-Zong (Gangwondo Veterinary Service Laboratory) ;
  • Jung, Ji-Hun (Seoul Metropolitan Government Research Institute of Public Health and Environment) ;
  • Won, Ho-Keun (Choongang Vaccine Laboratory) ;
  • Kang, Zheng-Wu (School of Veterinary Medicine, Kangwon National University) ;
  • Hahn, Tae-Wook (School of Veterinary Medicine, Kangwon National University)
  • 최원종 (강원도가축위생시험소동부지소) ;
  • 정지헌 (서울특별시 보건환경연구원) ;
  • 원호근 (중앙백신연구소) ;
  • 강정무 (강원대학교 수의학부대학) ;
  • 한태욱 (강원대학교 수의학부대학)
  • Published : 2008.03.30
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Abstract

Salmonella infections cause the disease in pigs but also some zoonotic Salmonella serotypes can be transmitted to human through swine products, resulting in food poisoning. The objective of this study was to investigate the bacteriological prevalence and detection of invA gene using Salmonella specific polymerase chain reaction (PCR), the epidemiological characteristics related to Salmonella strains cultured from pig samples in Gangwon areas using serotyping, random amplified polymorphic DNA (RAPD) and pulsed field gel electrophoresis (PFGE) methods. During the period of November 2001 through April 2002, 1,174 ileocecal lymph node were collected from the slaughtered pigs raised in 38 farms located in Gangwon province. The samples were submerged in boiling water and macerated in saline and lymph node homogenates were inoculated into Tetrathionate broth with iodine (TTB, Difco, 0.5% iodine was added) for enrichment growth. Then additional tests were performed using several mediums, and suspects were identified by API 20E kit (BioMerieux) and PCR. Of total 1,174 samples from 38 farms, 44 (3.7%) were isolated as Salmonella spp from 13 farms (34.2%). Of 44 isolates, 31 were in Yangyang region, followed by 9 in Goseong, 2 in both Gangneung and Sokcho. However, there was no difference in regional isolation frequency. All isolates have a 521bp amplified product in Salmonella specific PCR with primer invA which encodes in proteins for invasion of epithelial cells. Of 44 recovered serotypes, 23 (52.3%) were S Eingedi, 10 (22.7%) S Schwarzengrund, 9 (20.5%) S Typhimurium, and 2 (4.5%) S Mbandaka. In RAPD analysis, there appeared to be unique bands distinguishing each serotype, although similarities exist between the different serotypes. Four serotypes of 44 Salmonella isolates appeared to fall into 14 different RAPD types. In PFGE analysis, 9 S Typhimurium were tested with XbaI enzyme and SpeI enzyme. The combination of results obtained with two enzymes subdivided the 9 S Typhimurium into 4 PFGE types.

Keywords

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