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  • Title: Pulmonary besnoitiasis in captive maras (Dolichotis patagonum) associated with interstitial pneumonia.
    Author: Rico-Hernández G, Juan-Sallés C, Garner MM, Barr BC.
    Journal: Vet Pathol; 2004 Jul; 41(4):408-11. PubMed ID: 15232142.
    Abstract:
    Six captive maras (Dolichotis patagonum) were found to have cysts consistent with Besnoitia in the lungs by light microscopy and electron microscopy. Three were juveniles that died with no premonitory signs during a 17-month period. The most prominent finding consisted of severe, subacute, diffuse interstitial pneumonia with syncytia and Besnoitia cysts. The severity of pneumonia correlated with the number of cysts and the presence of lytic cysts, often surrounded by chronic granulomatous inflammation. Disseminated infection was observed in one of these maras. The three other maras died of unrelated conditions and had a few Besnoitia cysts in their lungs with mild or no inflammation associated. This is the first report of besnoitiasis in maras and of its association with fatal interstitial pneumonia in any species. Although other agents may have caused the interstitial pneumonia described here, it is possible that zoites released from lytic cysts were involved in the development of this lesion.
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