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. 1973 May;3(5):555–558. doi: 10.1128/aac.3.5.555

Demonstration of R Factors in Bordetella bronchiseptica Isolated from Pigs

Nobuyuki Terakado 1,2, Hayami Azechi 1,2, Kiyoji Ninomiya 1,2, Takeshi Shimizu 1,2
PMCID: PMC444456  PMID: 4790610

Abstract

Transferability of drug resistance in strains of Bordetella bronchiseptica isolated from pigs was examined. These strains were resistant to sulfadimethoxine (SA, more than 1,600 μg/ml), streptomycin (SM, more than 800 μg/ml), and aminobenzyl penicillin (APC, 200 μg/ml). All of them could transfer their drug resistance as one unit to a sensitive strain of Escherichia coli as well as to B. bronchiseptica by mixed cultivation. The transferred SM-SA-APC resistance in the exconjugants of E. coli and B. bronchiseptica was also transmissible by mixed cultivation. But the transfer of triple resistance was not mediated by the cell-free filtrate of the drug-resistant strain of B. bronchiseptica which was used as donor. The triple resistance in the exconjugant E. coli ML1410 was found to be eliminated as a whole by treatment with acriflavin. According to these results, it could be safely concluded that R factors carrying SM-SA-APC resistance were demonstrated in strains of B. bronchiseptica isolated from pigs.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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