競走馬 분변에서 분리한 yersiniae의 생물형, 혈청형 및 항균약제 감수성

Bioserotypes, antimicrobial susceptibility and in vitro pathogenicity of yersiniae isolated form feces of racing horse

When examined the feces of 600 racing horses, yersiniae were isolated from 55 horses (9.2%). Out of 55 isolates, 33 isolates (60%) were Yersinia enterocolitica and 15 (27.3%) were Y. intermedia and 7 (12.7%) were Y. kristensenii. Out of 33 isolates of Y. enterocolitica, the predominant biotype was 1 comprising of 26 isolates (78.8%) and followed by biotype 2, comprising of 7 isolates (21.2%). The predominant serotype was 0 : 21 comprising of 20 isolates (60.6%) and followed by 0 : 5 comprising of 6 isolates (18.2%), 0 : 1 and 0 : 6 comprising of 1 isolate (3.0%), respectively. Yersiniae were resistant to cephalothin(96.4%), carbenicillin(94.5%), ampicillin(92.7%), but susceptible to polymyxin B(96.3%), tetracycline(98.2%), chloramphenicol(98.2%), streptomycin(98.2%), neomycin(100%), tobramycin(100%), kanamycin(100%), colistin(100%), gentamicin(100%) and nalidixic acid(100%). The predominant isolates of multiple antimicrobial resistance patterns were CF-AM (44 isolates : 81.5%). Of 4 in vitro pathogenicity tests(CRMOX, autoagglutination, calcium dependence and congo red absorption test) with 55 yersiniae, 8 strains(24.2%) of Y. enterocolitica were positive for only autoagglutination test, but others were negatives.