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The Journal of Medical Microbiology, Vol 25, Issue 3 221-225, Copyright © 1988 by Society for General Microbiology

JOURNAL ARTICLE

Abortive phage-infection and UV-protection markers on Col I plasmids from epidemic strains of Salmonella

R. M. Barker
Department of Microbiology, University of Dundee Medical School, Ninewells Hospital.

Cultures of Escherichia coli carrying ColI plasmids received in conjugation from strains of Salmonella typhimurium and S. agona were examined for abortive infection (Abi) of phage BF23 and for enhanced resistance to the lethal action of UV-irradiation (Uvr). The Abi character of stored cultures of E. coli was also compared with the reaction of the same stock culture tested 5 years before. Seven of the eight potential types differentiated by three characters were represented among 160 ColI plasmids: ColIa Abi+ Uvr+ (3 plasmids), ColIa Abi- Uvr+ (1), ColIa Abi- Uvr- (2), ColIb Abi+ Uvr+ (85), ColIb Abi+ Uvr- (5), ColIb Abi- Uvr+ (4), ColIb abi- Uvr- (60). Recognition that different plasmid types could be carried by strains of a clone proved useful in the interpretation of the epidemic spread of strains of S. typhimurium of phage type/biotype 141/9f in Scotland and in tracing the ancestry of a recently emerged rhamnose non-fermenting mutant strain of S. agona.


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