Epizootiology of leptospirosis in some wild mammals in western Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3t945v23k

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  • Two hundred thirteen mammals were captured on two study areas between April 1976 and August 1977. Samples of urine and kidney tissue from 202 mammals were cultured on media suitable for leptospiral growth. Leptospiral organisms were not isolated from tissue cultures. Sera from 88 mammals were examined by the microscopic agglutination-lysis test (MA). Seventeen percent of the sera examined had significant titers (1:100 or greater) to either Leptospira canicola or L. grippotyphosa. Eight striped skunks (Mephitis mephitis) had positive sera; titers ranged from 1:100 to 1:6400. Four opossums (Didelphis virginiana) had positive sera, with titers which ranged from 1:100 to 1:1600. Two eastern cottontail rabbits (Sylvilagus floridanus) had positive titers; one serum reacted to L. canicola at 1:100 and one reacted to L. grippotyphosa at 1:100. The red fox (Vulpes vulpes) serum reacted to L. canicola at a titer of 1:200. This is the first reported evidence of leptospirosis in mammals other than rodents and livestock in Oregon. There was no significant relationships between reactor rates and the sex or age of the mammals, or the study area on which the mammals were captured. There was a significant increase (P<0.05) in prevalence of reactors between 1976 and 1977. The increased prevalence during 1977 may have been related to increased precipitation during that year.
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