Ribotype diversity of porcine Pasteurella multocida from Australia

Bowles, R. E., Pahoff, J. L., Smith, B. N. and Blackall, P. J. (2000) Ribotype diversity of porcine Pasteurella multocida from Australia. Australian Veterinary Journal, 78 9: 630-635. doi:10.1111/j.1751-0813.2000.tb11940.x

Author Bowles, R. E.
Pahoff, J. L.
Smith, B. N.
Blackall, P. J.
Title Ribotype diversity of porcine Pasteurella multocida from Australia
Journal name Australian Veterinary Journal   Check publisher's open access policy
ISSN 0005-0423
Publication date 2000-09
Sub-type Article (original research)
DOI 10.1111/j.1751-0813.2000.tb11940.x
Volume 78
Issue 9
Start page 630
End page 635
Total pages 6
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell
Language eng
Formatted abstract
Objective: To use the technique of ribotyping to investigate the genetic diversity of Australian isolates of Pasteurella multocida associated with outbreaks of clinical disease in Australian pigs.

Design: One hundred and seven porcine P multocida isolates were analysed by ribotyping using the restriction enzymes HpaII and HindIII. The genetic population structure of the Australian porcine P multocida isolates was determined through statistical analysis of the joint ribotype patterns, and this was then compared with biochemical and epidemiological data available for the population.

Results: A total of 25 combined ribotypes were recognised, which were grouped into five ribotype clusters. Despite the deliberate selection of diverse isolates, the study revealed only a limited degree of genetic diversity. Fourteen of the ribotypes contained multiple isolates, and 12 of these ribotypes were present on more than one farm. Three of the seven biovars analysed in the study showed very limited diversity. All fifteen biovar 2 isolates (subsp multocida) were found in a single cluster (III), while all four biovar 8 isolates, which correspond to P multocida subsp gallicida, were allocated by themselves to a single cluster (IV). All nine of the biovar 12 isolates (lactose-positive subsp multocida) were assigned to a single cluster (I), together with the single biovar 14 isolate, which was the only other lactose-positive isolate in the population (ODC-negative).

Conclusion: A limited number of ribotypes of P multocida are associated with Australian pigs. The majority of these ribotypes are widely distributed across multiple farms, and across multiple states. Individual farms can possess multiple ribotypes of P multocida. Some of the unusual biochemical variants of P multocida present in Australian pigs have a very limited genetic diversity. The nature of pig production in Australia, primarily involving continuous flow systems with few closed herds, has possibly contributed to the widespread distribution of a limited number ribotypes.
Keyword Pigs
Pasteurella multocida
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
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Created: Mon, 07 Mar 2011, 14:39:28 EST