Bacteriology : Escherichia coli Isolates from Calf Diarrhea in Korea and Their Virulent Genetic Characteristics

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  • HUR Jin
    Veterinary Public Health, College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University, Jeonju 561–756, South Korea
  • JEON Byung Woo
    Veterinary Public Health, College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University, Jeonju 561–756, South Korea
  • KIM Yeong Ju
    Veterinary Public Health, College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University, Jeonju 561–756, South Korea
  • OH In Gyeong
    Veterinary Public Health, College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University, Jeonju 561–756, South Korea
  • LEE John Hwa
    Veterinary Public Health, College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University, Jeonju 561–756, South Korea

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  • <i>Escherichia coli</i> Isolates from Calf Diarrhea in Korea and Their Virulent Genetic Characteristics

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Escherichia coli strains were isolated from the feces of 130 diarrheic calves at different farms locations in Korea. The presence of the virulence genes, such as fanC, f41, f17a, eaeA, clpG, afa-8D, sta, stx1 and stx2, in each E. coli isolate was examined. Among the 314 isolates, 157 carried one or more of the virulence genes tested in this study. The most prevalent virulence gene was clpG (45.9%), although f17A (36.9%) and afa-8D (21.7%) were also frequently observed. The sta, stx1 and eaeA genes were detected in between approximately 13 and 17% of the isolates, and the fanC and fim41a genes were detected to a lesser extent. Collectively, our data indicated that diarrhea in calves in these locations can be ascribed to various virulence factors, and the pathogenesis may be more related to virulence genes such as, clpG, f17A, and afa-8D.

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