Abstract
Drug-resistant strains of E. coli isolated from 100 samples of ground pork were surveyed for drug sensitivity, drug resistance pattern and presence of R factors.Drugs tested were 7 kinds such as tetracycline (TC), chloramphenicol (CM), streptomycin (SM), sulfanilamide (SA), kanamycin (KM), ampicillin (APC) and nalidixic acid (NA). The results are summarized as follows;1. The detection of drug resistant E. coli in ground pork was proved 57 cases out of 70 samples (81%) in summer research, but none in winter research.2. All of strains were resistant to either one or various combinations of the 6 drugs and they were all sensitive to nalidixic acid.Ninety-three per cent of these resistant strains were of multiple resistance, while the rest were of single resistance.3. The most frequent patterns of drug resistance in these strains were TC, SM, SA (20%), TC, SM, SA, KM (18%), and TC, SM (12%).4. It was also found that about 42% of these resistant strains possessed R factors capable of conjugal transfer.
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