- Volume 16 Issue 2
Antibiotic Resistance of Escherichia coli from Pigs Fed with Antibiotics-containing Feedstuffs
돈유래(豚由來) Escherichia coli의 항생물질내성(抗生物質耐性) 및 전달성내성인자(傳達性耐性因子)에 관(關)하여
- Tak, Ryun Bin (Department of Veterinary Medicine, College of Agriculture, Gyeongbug University) ;
- Chung, Gill Taik (College of Veterinary Medicine, Seoul National University)
- Published : 1976.10.20
One hundred and sixty one Escherichia coli strains isolated from 24 swine (11 swine fed with feedstuffs containing 7.5mg/kg of tetracycline and 13 swine not received antibiotic) were studied for the drug resistance and distribution of R factors. About 42 per cent of E. coli strains isolated from pigs of a herd fed with tetracycline (TC)-containing feeds were resistant to TC, streptomycin(SM), sulfisomidine(SA), ampicillin (AP) and kanamycin (KM), alone or in combination thereof, but none of the swine not receiving antibiotic containing feedstuffs excreted E. coli resistant to these drugs, Among resistant strains, 18.2% were found to be singly resistant to TC, whereas 81.8% were resistant to two or more antibiotics. The most common pattern was the triple resistant to TC, SM and SA(30.3%), and follolwed by double ones to TC and SM(24.2%). About one half of resistant strains carried R factors which were tranferable to the recipients by conjugation. In spite of feeding with feedstuffs containing only TC, high incidences of multiple resistance and R factors were observed in the E. coli isolated from these swine.