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  • Title: Systemic toxoplasmosis in a five-month-old beaver, (Castor canadensis).
    Author: Forzán MJ, Frasca S.
    Journal: J Zoo Wildl Med; 2004 Mar; 35(1):113-5. PubMed ID: 15193086.
    Abstract:
    A 5-mo-old orphan beaver, Castor canadensis, died of severe systemic toxoplasmosis during rehabilitation. Histologic lesions included lymphohistiocytic encephalitis, myocarditis, and interstitial pneumonia with multinucleated cells. Intracytoplasmic cysts containing tachyzoites and bradyzoites identified as Toxoplasma gondii by immunohisto-chemistry were present in macrophages, type-II pneumocytes, and endothelial cells. Immunohistochemistry using a polyclonal morbillivirus antibody and transmission electron microscopy of lung revealed no evidence of concurrent paramyxoviral infection, as commonly found in carnivores with toxoplasmosis. Toxoplasmosis may affect young beavers in rehabilitation and zoological settings.
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