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Phenotypic characterisation of Pasteurella multocida isolates from Australian pigs
P J Blackall1, J L Pahoff, R Bowles
1Queensland Department of Primary Industries, Animal Research Institute, Yeerongpilly QLD, Australia. blackap@dpi.qld.gov.au
Veterinary Microbiology
|January 28, 1998
Summary
This study characterized 150 Pasteurella multocida pig isolates from Australia, finding biovar 3 most common. Unusual variants of Pasteurella multocida subsp. multocida were also identified.
Area of Science:
- Veterinary Microbiology
- Bacteriology
- Animal Health
Background:
- Pasteurella multocida is a significant bacterial pathogen in pigs.
- Previous studies have characterized P. multocida isolates from Australian poultry.
- Understanding the phenotypic diversity of P. multocida in Australian pigs is crucial for disease management.
Purpose of the Study:
- To perform a phenotypic characterization of 150 P. multocida isolates from Australian pigs.
- To identify and classify the biochemical biovars present in these isolates.
- To compare findings with previous characterizations of P. multocida from other animal hosts.
Main Methods:
- Phenotypic characterization of 150 bacterial isolates identified as P. multocida.
- Isolates were sourced from pigs in Queensland, New South Wales, and Victoria, Australia.
- Biochemical tests were used to assign isolates to different biovars and subspecies.
Main Results:
- Seven distinct biochemical biovars were identified among the 150 isolates.
- Biovar 3 was the most prevalent, accounting for 67% of isolates, consistent with poultry isolates.
- 124 isolates were identified as P. multocida subsp. multocida, and 13 as P. multocida subsp. gallicida.
- Unusual variants of P. multocida subsp. multocida were noted, including lactose-positive and ornithine decarboxylase-negative strains.
Conclusions:
- The phenotypic characterization revealed significant biochemical diversity within P. multocida isolates from Australian pigs.
- Biovar 3 represents a common type in pigs, similar to poultry isolates.
- The identification of unusual variants highlights the need for ongoing surveillance and characterization of P. multocida strains.