Abstract
A survey for drug resistance and distribution of R factors was conducted among the Escherichia coli strains isolated from 151 swines feeded with animal food containing tetracycline. It was found that all swines excreted resistant E. coli strains with reference to 4 drugs, tetracycline (TC), chloramphenicol (CM), streptomycin (SM) and sulfanilamide (SA), which are most common resistance pattern in transmissible drug resistance factor “R”.Among 278 resistant cultures, the resistance patterns included 13% of single resistance and 87% of multiple resistance. It was also found that about 32% of these resistant strains carried R factors.The resistance patterns of R factors included 36% of single resistance and 64% of multiple resistance.It was noticed that multiple resistant E. coli strains and R factors carrying multiple resistance patterns were isolated at high frequency, even though these swines were feeded with animal food containing a single drug, tetracycline.
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