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Bacteriophage restriction in Salmonella typhimurium by R factors and transfer factors

  • E. S. Anderson (a1), E. J. Threlfall (a1), Jacqueline M. Carr (a1) and L. G. Savoy (a1)

Summary

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 Coll-like fi factors were equally distributed in bovine S. typhimurium. Coll-like factors were commonest in bovine and avian E. coli.

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References

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Anderson, E. S. (1964). In The World Problem of Salmonellosis (ed. van Oye, E.), p. 89. The Hague: Dr W. Junk.
Anderson, E. S. (1965). A rapid screening test for transfer factors in drug-sensitive Enterobacteriaceae. Nature, London 208, 1016.

Bacteriophage restriction in Salmonella typhimurium by R factors and transfer factors

  • E. S. Anderson (a1), E. J. Threlfall (a1), Jacqueline M. Carr (a1) and L. G. Savoy (a1)

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