Susceptibility of Escherichia coli Isolated from Cattle to Some Antimicrobial Agents

Park, Cheong Kyu

Korean Journal of Veterinary Research 1977;17(1):5-8.

Cheong Kyu Park

Department of Veterinary Medicine, College of Agricalture，Gyeongbug National University

소에서 분리(分離)한 Escherichia coli의 항생물질내성(抗生物質耐性) 및 전달성내성인자(傳達性耐性因子)의 분포(分布)

박청규

경북대학교 농과대학 수의학과

Abstract

One hundred and fifty seven Escherichia coli strains isolated from 18 cattle (9 dairy cattle received penicillin, streptomycin (SM) or sulfadimethoxine for treatment of diseases and 9 Korean native cattle not received antibiotics) were studied for the drug resistance and distribution of R factors. Of 88 E. coli strains isolated from cattle not received antibiotics, only 1 strain was resistant to SM, but about 46 per cent of 69 E. coli strains isolated from cattle received antibiotics were resistant to SM, tetracycline (TC), ampicillin (AP), kanamycin (KM), chloramphenicol (CM), and sulfisomidine (Su), alone or in combination thereof. Of resistant strains, about 72% were resistant to three or more antibiotics, but 28% were found to singly resistant. The most frequent resistant pattern was triple resistance to AP, KM and Su (37.6%), and quadruple one to SM, TC, CM and Su (12.5%). About 28% of resistant strains carried R factors which were transferable to E. coli ML 1410 $NA^r$ by conjugation.