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. 1968 Aug;47(8):1763–1773. doi: 10.1172/JCI105866

The influence of bacteriocins on resistance to infection by gram-negative bacteria

II. Colicin action, transfer of colicinogeny, and transfer of antibiotic resistance in urinary infections

Abraham I Braude 1, J S Siemienski 1
PMCID: PMC297336  PMID: 4875004

Abstract

Dual urinary infections were produced in rats with colicinogenic Escherichia coli CF1, elaborating colicin V in the urine, and colicine-sensitive E. coli 9224 by injecting each organism into the medulla of opposite kidneys. The colicin-sensitive organism was eradicated from the urine of 24.3% of rats and the degree of infection by E. coli 9224 reduced to less than half of the control group. Colicin-resistant mutants of E. coli 9224 were not inhibited in mixed infections with colicin producing E. coli CF1. No evidence of inhibitory activity by colicin V was found in the kidneys. The bladder urine, but not the kidney, was also the site for transfer of colicinogeny between homologous (E. coli) and heterologous (E. coli and Aerobacter aerogenes) species. Episomes controlling colicin V and J + I were transferred within 24 hr after establishing the mixed infection. Since E. coli 9224 was resistant to streptomycin and tetracycline, observations were also made on transmission of multiple drug resistance. Streptomycin and tetracycline resistance was readily transferred to E. coli CF1 within 48 hr in the bladder. These results demonstrate that in urinary infections colicins can kill susceptible bacteria and that bacterial genetic elements are transferred.

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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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