Korean Journal of Veterinary Research 1991;31(1):55-61.
Studies on pathogenicity of Escherichia coli isolated from chickens: Correlation between in vitro Congo-red binding properties and in vivo virulence in avian Escherichia coli
Yong Ku Woo1, Ki Seuk Kim1, Bong Hwan Kim2
1Veterinary Research Institute
2College of Veterinary Medicine, Kyungpook National University
닭유래 Escherichia coli의 병원성에 관한 연구 : 시험관내 Congo-red 결합능과 병원성간의 상관관계
우용구1, 김기석1, 김봉환2
1가축위생연구소
2경북대학교 수의과대학
Abstract
The correlation between in vitro Congo-red binding properties of E coli and in vivo invasiveness of the organisms in SPF chickens and mice was investigated. Congo-red positive E coli colonies were dark-red color with a typical colonial morphology of rough appearance when grown on Congo-red medium, while Congo-red negative colonies showed pale-pink color and smooth surfaced colonial morphology. Pathogenicity of 10 Congo-red positive E coli for mice was observed in 92.5% but that of 5 Congo-red negative E coli was 45%. Invasiveness of 10 Congo-red positive E coli for chickens was observed in 96% of the SPF chickens tested but that of 5 Congo-red negative E coli was 16% only. These results of pathogenicity studies with E coli isolates indicate a significant correlation between Congo-red binding ability and virulence in avian Escherichia coli.
Key Words: avian Escherichia coli, Congo-red binding properties, pathogenicity
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