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  • Title: Serological survey for evidence of Leptospira interrogans in free-living platypuses (Ornithorhynchus anatinus).
    Author: Loewenstein L, McLachlan-Troup T, Hartley M, English A.
    Journal: Aust Vet J; 2008 Jun; 86(6):242-5. PubMed ID: 18498563.
    Abstract:
    OBJECTIVE: To survey free-living platypuses for evidence of Leptospira interrogans. METHODS: A serological study of Leptospira antibodies was carried out on 21 platypuses captured between May and October 2001 in the Wollondilly River 200 km south of Sydney, New South Wales. RESULTS: Positive reactions, all to the L Hardjo serovar, were seen in 14 (66%) of the captured animals, with adult males showing a higher prevalence of antibodies than adult females. Several individual platypuses showed a high titre of L Hardjo antibodies, and some animals demonstrated cross-reactions to the serovars L Medanensis and L Kremastos. CONCLUSION: The serological findings demonstrate that these animals are constantly exposed to infection with Leptospira in their environment, but it is not known if platypuses suffer from clinical leptospirosis or if they mount an immune response, but are unaffected by the bacteria. The prevalence of Leptospira infection among the platypus population could not be precisely estimated because of the unknown number of individuals inhabiting the Wollondilly River inside the survey property. Domestic livestock, mostly cattle, may be the major source of Leptospira infection. The effects of this disease on population dynamics and on reproduction in wild platypuses are not well understood. The role of other wildlife in the transmission and maintenance of Leptospira in the environment is unknown.
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