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Bacteriophage restriction in Salmonella typhimurium by R factors and transfer factors

Published online by Cambridge University Press:  15 May 2009

E. S. Anderson ,
E. J. Threlfall ,
Jacqueline M. Carr  and
L. G. Savoy
E. S. Anderson
Affiliation:
Enteric Reference Laboratory, Central Public Health Laboratory, Colindale Avenue, London, NW9 5HT, England
E. J. Threlfall
Affiliation:
Enteric Reference Laboratory, Central Public Health Laboratory, Colindale Avenue, London, NW9 5HT, England
Jacqueline M. Carr
Affiliation:
Enteric Reference Laboratory, Central Public Health Laboratory, Colindale Avenue, London, NW9 5HT, England
L. G. Savoy
Affiliation:
Enteric Reference Laboratory, Central Public Health Laboratory, Colindale Avenue, London, NW9 5HT, England
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Summary

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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.

Type
Research Article
Information
Journal of Hygiene , Volume 71 , Issue 3 , September 1973 , pp. 619 - 631
Copyright
Copyright © Cambridge University Press 1973

References

REFERENCES

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