Antibiotic Resistance of Escherichia coli Isolated from Hens

Tak, Ryunbin

Korean Journal of Veterinary Research 1977;17(1):1-4.

Ryunbin Tak

Department of Veterinary Medicine, College of Agriculture, Gyeonglug National University

계유내(鷄由來) Escherichia coli의 항생물질내성(抗生物質耐性)및 R 인자(因子)의 분포(分布)

탁련빈

경북대학교 농과대학 수의학과

Abstract

Two hundred and twenty-seven strains of Escherichia coli isolated from 25 hens (12 hens received tetracycline neomycin and sulfadimethoxine, and 13 hens not received antibiotics) were studied for the drug resistance and distribution of R factors. About 74 per cent of E. coli strains isolated from hens of a herd received antibiotics were resistance to tetracycline (TC) streptomycin (SM), chloramphenicol (CM), kanamycin (KM), ampicillin (AP) and sulfisomidine (Su), alone or in combination thereof, but only a hen among a herd not received antibiotics excreted E. coli resistant to TC and SM. Among resistant strains, about 7% were found to be resistant to TC and SM, whereas 93% were resistant to three or more antibiotics. The most common pattern was the quadruple resistant to SM, TC, KM and Su (28.7%), and followed by triple ones to SM, TC and Su (25.3%), and SM, TC and KM (24.7%). About 84% of resistant strains carried R factors which were transferable to the recipient by conjugation.