INCOMPATIBILITY OF R PLASMIDS DERIVED FROM SALMONELLA AND ESCHERICHIA-COLI STRAINS ISOLATED SIMULTANEOUSLY FROM A BOVINE FECAL SAMPLE

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Abstract
Seven strains of S. typhimurium isolated from 2 fecal samples of calves were resistant to ampicillin, chloramphenicol, kanamycin, nalidixic acid, streptomycin, sulfadimethoxine and tetracycline. E. coli strains (11) obtained from 1 of the 2 samples possessed the identical drug resistance pattern. The thermosensitive R plasmids conferring sextuple drug resistance and Hg resistance from Salmonella strains were Fi- (no fertility inhibition) and belonged to incompatibility group H1; conjugative 6 R plasmids isolated from 11 E. coli strains were Fi+ and belonged to incompatibility group FII. Thermosensitive R plasmids conferring sextuple drug resistance (ampicillin, chloramphenicol, kanamycin, streptomycin, sulfadimethoxine and tetracycline) were never reported in Japan. The genetic relationship of R plasmids derived from the multiresistant strains of Salmonella and E. coli is discussed on the basis of incompatibility properties of R plasmids.