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Journal of Veterinary Diagnostic Investigation, Vol 12, Issue 6, 535-540
Copyright © 2000 by American Association of Veterinary Laboratory Diagnosticians

Articles

Ribotyping and restriction endonuclease analysis reveal a novel clone of Bordetella bronchiseptica in seals

KB Register, RE Sacco, and G Foster

Avian and Swine Respiratory Diseases Research Unit, USDA/Agricultural Research Service/National Animal Disease Center, Ames, IA 50010, USA.

The goal of the present study was to characterize, by ribotyping and restriction endonuclease analysis (REA), 35 phocine Bordetella bronchiseptica isolates and to ascertain their relationship to one another and to isolates acquired from other host species. Thirty-four isolates were obtained in Scotland during a 10-year period encompassing the 1988 epizootic; the remaining isolate was obtained independently in Denmark. All phocine isolates had an identical Pvu II ribotype unique from the 18 ribotypes previously detected in strains from heterologous hosts. Alternative restriction enzymes, useful for subgrouping strains within Pvu II ribotypes, also failed to discriminate among isolates from seals. The exclusive occurrence of a single ribotype of B. bronchiseptica in a particular host species has not been previously observed. Similarly, REA based on either HinfI or Dde I profiles did not reveal detectable polymorphisms, although unique patterns were readily distinguished among a limited number of isolates from other host species. This is the first report demonstrating the utility of REA using frequently cutting enzymes for discrimination of B. bronchiseptica strains. These data suggest that B. bronchiseptica-induced respiratory disease in seals along the Scottish shore may be due to the circulation of a single, unique clone.


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