PMID: 7026672Oct 1, 1981Paper

Change of drug resistance patterns and genetic properties of R plasmids in Salmonella typhimurium of bovine origin isolated from 1970 to 1979 in northern Japan

The Journal of Hygiene
S MakinoN Seno

Abstract

A total of 321 Salmonella typhimurium strains of bovine origin obtained in northern Japan during the period 1970-1979 were tested for drug resistance and detection of conjugative R plasmids. Three hundred and eighteen (99.1%) of these strains were resistant to one or more drugs. The isolation frequently of multiply drug-resistant strains tended to increase year by year. Two hundred and thirty-seven (74.5%) of these resistant strains carried conjugative R plasmids. A total of 308 R plasmids including 174 (56.5%) thermosensitive (ts) R plasmids were derived from the 237 drug-resistant strains, indicating that 71 (30.0%) strains have two different conjugative R plasmids in a single host cell. Of the 308 R plasmids examined for fertility inhibition (fi), 167 ts and 131 non-ts R plasmids were fi-. Of the 60 ts r plasmids examined for incompatibility, 50 were classified into H1 group and 10 into H2 group. Of the 52 non-ts R plasmids examined, 35 were classified into the I alpha-group and the remaining plasmids were untypable in our tests. Mercury resistance marker was found in about 20% of H1 R plasmids coding for multiresistance, and all of H2 R plasmids coded for resistance to tellurite. The clonal distribution of an S. typhimurium...Continue Reading

References

Feb 1, 1979·The Journal of Infectious Diseases·M M McConnellE S Anderson
Jun 1, 1977·Antimicrobial Agents and Chemotherapy·H NakaharaH Kozukue
Nov 1, 1979·Applied and Environmental Microbiology·N IshiguroG Sato
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Oct 1, 1976·Antimicrobial Agents and Chemotherapy·D E Taylor, R B Grant
Aug 1, 1973·Journal of Bacteriology·H R SmithE S Anderson
Aug 10, 1968·British Medical Journal·E S Anderson
Oct 1, 1980·Nihon juigaku zasshi. The Japanese journal of veterinary science·N TerakadoK Ohmae
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