닭에서 分離한 Escherichia coli의 重金屬 및 抗生物質耐性에 關하여

Resistance to heavy metals and antibiotics in Escherichia coli isolated from chicken

Escherichia coli isolated from chicken were studied for their resistance to heavy metals and antibiotics, and the relationship between the resistance to heavy-metals and antibiotics were evaluated. Resistance to arsenic(As), lead(Pb) and mercury(Hg) were found in 89.0, 71.4 and 16.5%, respectively, whereas all strains were sensitive to cadmium. Cultures with resistance to two metals (double) were isolated most frequently, followed by those resistant to one metal (single) and then those resistant to three (triple). The frequencies of resistance to tetracycline, streptomycin, chloramphenicol, ampicillin and kanamycin were 96.9, 70.9, 29.5, 23.9 and 5.3%, respectively. About 81% of multiple heavy-methal resistant strains were also resistant to 2 or more antibiotics. Among the above, 37 mercury and antibiotics resistant isolates were tested for their ability to transfer the restisance to susceptible strains of E. coli ML 1410. R plasmid carrying mercury resistance were demonstrated in 78% of the mercury- resistant strains of E. coli and almost antibiotics resistance were transfered simultaneously.