RESUMO
A large commercial flock of Hungarian partridge (Perdix perdix) experienced elevated mortality associated with a wasting disease in May 1998. Postmortem examination of females consistently revealed a distended crop and abnormal gray-white tissue infiltrating the wall of the crop and thoracic esophagus. Neoplasia in male partridge was observed in the liver. Microscopic examination of the crop and thoracic esophagus revealed transmural masses of immature lymphocytes with frequent mitotic figures. Similar cells were observed in the liver of affected males. Virus particles consistent in size and morphology with reticuloendotheliosis virions were observed in neoplastic lymphoid cells via electron microscopy. Reticuloendotheliosis virus was isolated from each of four blood samples. This disease has not previously been reported in Hungarian partridges. Hungarian partridge may represent a potential reservoir of infection for other gamebirds, including prairie chickens.
Assuntos
Doenças das Aves/patologia , Vírus da Reticuloendoteliose/isolamento & purificação , Reticuloendoteliose Aviária/veterinária , Infecções por Retroviridae/veterinária , Infecções Tumorais por Vírus/veterinária , Animais , Doenças das Aves/virologia , Aves , Papo das Aves/patologia , Papo das Aves/ultraestrutura , Papo das Aves/virologia , Neoplasias Esofágicas/patologia , Neoplasias Esofágicas/veterinária , Neoplasias Esofágicas/virologia , Esôfago/patologia , Feminino , Neoplasias Hepáticas/patologia , Neoplasias Hepáticas/veterinária , Neoplasias Hepáticas/virologia , Masculino , Microscopia Eletrônica/veterinária , Vírus da Reticuloendoteliose/ultraestrutura , Reticuloendoteliose Aviária/patologia , Reticuloendoteliose Aviária/virologia , Infecções por Retroviridae/patologia , Infecções por Retroviridae/virologia , Infecções Tumorais por Vírus/patologia , Infecções Tumorais por Vírus/virologia , Vírion/isolamento & purificação , Vírion/ultraestruturaRESUMO
Formalin-fixed kidney tissues from adult egg-laying chickens in two houses of an egg-production complex in the upper Midwest were submitted to Iowa State University for histopathologic examination. An increased incidence of visceral gout, average daily mortality 1%-2% higher than expected, and egg production within normal limits were observed in both houses. Numerous developing stages of Cryptosporidium were observed on the apical surface of epithelial cells lining renal collecting tubules and ureters. Scanning and transmission electron microscopy were used to visualize colonization of cryptosporidia, disruption of microvilli, and exfoliation of parasitized epithelial cells. Lymphoplasmacytic infiltration in the wall of ureters and hyperplasia of parasitized epithelial cells resulted in partial obstruction of ureters, which may have induced visceral gout in affected hens. This is the first report of urinary tract cryptosporidiosis occurring in adult hens in a modern commercial egg-production facility.
