Lesões cutâneas tipo tumorais associadas à infeção por avipoxvirus em uma marreca-cabocla (Dendrocygna autumnalis)

Abstract

The fowlpox, also known as contagiosum epithelioma, is caused by a poxvirus of the genus Avipoxvirus and affects both domestic and wild birds. The disease has two forms cutaneous and diphtheria. In March 2008 the sector of rehabilitation of wild birds from Mangual das Garças Park, located in Belém, Pará attended a duck (Dendrocygna autumnalis) that had nodular lesions in regions of the wing devoid of feathers. The lesions consisted of two large cutaneous tumor-like nodules that measured 4,2 x 3,8 cm and 2,8 x 2,2 cm in length and width, respectively. The nodules were surgically removed, fixed in 10% formalin, processed and stained with hematoxylin-eosin. Histopathology showed acanthosis and expressive hyperkeratosis, some cells showed spongiosis. The confirmatory diagnosis of fowlpox was established by the pathognomonic sign of the presence of large intracytoplasmic eosinophilic inclusion corpuscles (Bollinger bodies) in epithelial cells. This is the first report of poxvirus infection in a wild bird in the State of Pará, Brazil.