Tularemia in wild rodents and lagomorphs in Canada. Gary Wobeser, Canadian Cooperative Wildlife Health Centre, Department of Veterinary Pathology, U of Sask. “ Few, if any zoonotic diseases have a broader or more complex host distribution and epizootiology” (Petersen & Schriefer, 2005).
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Gary Wobeser, Canadian Cooperative Wildlife Health Centre, Department of Veterinary Pathology, U of Sask.
“Few, if any zoonotic diseases have a broader or more complex host distribution and epizootiology” (Petersen & Schriefer, 2005)
1912 Bacterium tularense isolated
1914 human disease associated with cottontail rabbits (“rabbit fever”) and later with deerfly bites (“deerfly fever)
Type B is associated with rodents and water transmission but also occurs in terrestrial situationsGenerally accepted that:
in wild rodents and lagomorphs
Tularemia identified more commonly in beaver than in muskrats or snowshoe hares, but hares and muskrats are more common source of human infection
Beaver larger and more valuable,
more likely to be submitted to laboratory
More people handle more muskrats and
Human tularemia is a rare disease in Canada, e.g., prior to 1970, 220 cases in Canada vs. 33,089 cases in USA
>90% of human cases in USA are tick-transmitted; tick transmission to humans is rare in Canada
Different “rabbits” are associated with tularemia
Nuttal’s cottontail rabbit
will be the unraveling
of the natural reservoirs
of Francisella tularensis”
(Tärnvik &Berglund, 2003)