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Journal of Veterinary Diagnostic Investigation, Vol 10, Issue 1, 49-55
Copyright © 1998 by American Association of Veterinary Laboratory Diagnosticians

Articles

Biovariants of isolates of Pasteurella from domestic and wild ruminants

MD Jaworski, DL Hunter, and AC Ward

University of Idaho, Caine Veterinary Teaching and Research Center, Caldwell 83605, USA.

A total of 608 bacterial isolates previously identified as Pasteurella haemolytica biotypes A and 3, P. trehalosi, and P. multocida, were separated into 73 distinct biovariants using 21 phenotypic characteristics. The largest group (54%) of wildlife isolates was identified as biogroup 2 and biogroup 2 variants. Biogroup 2 and biogroup 2 variants accounted for only 17% of isolates from domestic ruminants and were all from sheep. In contrast, 43% of isolates from domestic ruminants were identified as biogroup 1 and biogroup 1 variants, whereas only 6% of isolates from wildlife were identified in these groups. The majority of biogroup 1 isolates from wild ruminants were from 1 group of bighorn sheep in Arizona that were geographically separated from other wildlife sampled. Similarly, 1 biogroup 2 variant, 2E, was cultured only from free-ranging Dall sheep in Alaska. Twelve percent of domestic isolates and 6% of wildlife isolates were indole positive. The remaining isolates from wildlife (33%) and domestic animals (30%) were distributed among 53 distinct biovariants. None of these individual biovariants represented >4% of the total isolates. Phenotypic characterization was valuable for distinguishing between isolates from different hosts and from different geographic areas and can be used to assist in epidemiologic studies.


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