Abstract
A total of 76 Salmonella strain (70 S. typhimurium and 6 S. dublin) isolated from calves in 1984 to 1987 were examined for drug resistance and prevalence of R plasmids. High incidence of multiple drug resistance was observed in the S. typhimurium strain, of which over 60% showed multiple resistance to tetracycline (TC), chloramphenicol (CP), streptomycin (SM), kanamycin (KM), aminobenzylpenicillin (ABPC), and salfOnamide (SA). Of 57 drug-resistant Salmonella strains (51 S. typhimurium and 6 S. dublin) examincd, 41 (72%) wcrc found to carry R plasmids, capablc of performing a conjugal transfer.
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