Abstract
A total of 201 Escherichia coli strains isolated from diseased animals (calf, 119 strains; pig, 82 strains) from 1984 to 1987 were examined for drug resistance and prevalence of R plasmids. In calf strains, percent resistances to each drug were as follows: tetracyclin (TC), 59.7%; chloramphenicol (CP), 21.0%; streptomycin (SM), 52.9%; sulfadimethoxine (SA), 37.8%; kanamycin (KM), 45.4%; aminobenzyl penicillin (ABPC), 43.7%; and nalidixic acid (NA), 28.6%. In pig strains, percent resistances to each drug were as follows: TC, 98.8%; CP, 20.7%; SM, 63.4%; SA, 80.5%; KM, 67.1%; ABPC, 41.5%; NA, 2.4%; and trimethoprime (TMP), 6.1%. Of the 164 drug resistant E. coli strains (82 calf strains, 82 pig strains) examined, 88 (53.7%) were found to carry R plasmids, capable of performing a conjugal transfer.
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