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. 1973 Sep;71(3):619–631. doi: 10.1017/s0022172400046611

Bacteriophage restriction in Salmonella typhimurium by R factors and transfer factors

E S Anderson, E J Threlfall, Jacqueline M Carr, L G Savoy
PMCID: PMC2130588  PMID: 4584174

Abstract

A total of 2716 R factors and transfer factors isolated from Escherichia coli and salmonellas of human and animal origin were studied for their phage-restrictive effects in Salmonella typhimurium phage type 36. All of 1402 wild fi+ factors were non-restricting. The F factor of E. coli K12 was unique among the F-like factors tested in that it inhibited lysis of type 36 by one typing phage. In contrast, eleven distinct changes in the phage type of 36 were produced by fi- I-like factors. I-like plasmids can thus be subdivided by this method.

I-like R factors and transfer factors from human and animal enterobacteria were categorized by their phage-restrictive effects in type 36. Factors resembling Δ in this respect predominated among fi- I-like factor from human E. coli and S. typhimurium and from porcine E. coli. Δ-like and ColI-like fi- factors were equally distributed in bovine S. typhimurium. ColI-like factors were commonest in bovine and avian E. coli.

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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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