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강호조(Ho Jo Kang),손원근(Won Geun Son),이제용(Je Young Lee),강광식(Gwang Sig Kang) 한국예방수의학회 1993 예방수의학회지 Vol.17 No.1
This study was conducted to investigate the colonization characteristics of Listeria monocytogenes in chickens. A total of 70 chickens were challenged orally with either 10², 10⁴, and 10⁶ cells of L. monocytogenes strain Scott A (serotype 4b) and wild strain(serotypel) at newly hatched chicks. Seven days after the challenge, the cecum, duodenum, spleen, liver and cloacal swabs were sampled from each chick and were analysed for the presence of L. monocytogenes. Serotype 4b strain was a dose-related colonization response(10⁶〉10²) ; and more recoveries were obtained from the cecum, duodenum and cloacal swabs than from the spleen and liver. L. monocytogenes was discharged(1.0-5.7 CFU log₁₀) for 7 days after the challenge, and after that, organisms were not recovered from any cloacal swabs.
가축 유래 staphylococcus aureus의 enterotoxin 산생과 plasmid profile에 관한 연구 V. R-plasmid의 분리 및 전이
강호조(Ho Jo Kang),김용환(Young Hwan Kim),손원근(Won Geun Son),강광식(Gwang Sig Kang),이제용(Je Young Lee) 한국예방수의학회 1992 예방수의학회지 Vol.16 No.1
Animal source strains of Staphylococcus aureus were studies for the profiles of plasmids and the transfer of resistance plasmid by conjugation. A total of 50 isolates of S. aureus were subjected to the test for the presence of plasmid DNA. The isolates of bulk milk, chicken and Pig origin had 1 to 5 plasmid element. The plasmids recovered from these organisms had molecular weight ranging from 1.3 to 63 kb, 0.94 to 63 kb and 1.1 to 44 kb, respectively. In the strains isolated from bulk milk, the majority of the isolated plasmids was large molecular weight and they had one plasmid element. On the other hand, small molecular weight plasmids were predominant and they had multiple plasmid element in the isolates of chicken origin. Tetracycline and gentamicin resistant plasmid of S. aureus were transferable between S. aureus by filter mating method, but in the broth mating method were not transferable plasmids. The frequencies of tetracycline plasmid transfer between S. aureus strains were 2.0-5.2×10⁻⁷, and gentamicin plasmids transfer were 1.2×10⁻⁸.