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Genotype analysis of faecal and blood isolates of Salmonella dublin from humans in England and Wales

Published online by Cambridge University Press:  19 October 2009

N. Chowdry ,
E. J. Threlfall ,
B. Rowe  and
J. Stanley
N. Chowdry
Affiliation:
NCTC Molecular Genetics Unit, Central Public Health Laboratory, Public Health Laboratory Service, 61 Colindale Avenue, London NW9 5HT, UK
E. J. Threlfall
Affiliation:
Laboratory of Enteric Pathogens, Central Public Health Laboratory, Public Health Laboratory Service, 61 Colindale Avenue, London NW9 5HT, UK
B. Rowe
Affiliation:
Laboratory of Enteric Pathogens, Central Public Health Laboratory, Public Health Laboratory Service, 61 Colindale Avenue, London NW9 5HT, UK
J. Stanley*
Affiliation:
NCTC Molecular Genetics Unit, Central Public Health Laboratory, Public Health Laboratory Service, 61 Colindale Avenue, London NW9 5HT, UK
*
*Corresponding author.
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An analysis of genotype was made for representative strains of Salmonella dublin. The collection consisted primarily of strains isolated from humans in England and Wales, and were of both intestinal and extra-intestinal origin. Three genetic elements were characterized by DNA hybridization. They were the sprBC genes, extrachromosomal virulence determinants. the salmonella-specific insertion sequence IS200, and the 16S ribosomal RNA genes, a phylogenetic marker. Two clones of S. dublin (SdRI and SdRII) which shared an identical IS200 profile, were identified on the basis of restriction fragment length polymorphism at the 16S rRNA locus. With one exception, all strains harboured a 52 MDa plasmid which contained a conserved 3·7 kbp Hind III fragment homologous to the sprBC mouse-virulence genes of S. typhimurium. However, a single plasmid-free strain of SdRI, isolated from a patient with septicaemia exhibited no spc homology. In SdRI there was no observable genotype distinction between strains causing gastroenteritis or bacteraemia. In contrast, none of the strains of SdRII were from cases of bacteraemia, and all human isolates of this clone were from cases of gastroenteritis.

Type
Research Article
Information
Epidemiology & Infection , Volume 110 , Issue 2 , April 1993 , pp. 217 - 225
Copyright
Copyright © Cambridge University Press 1993

References

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