title: Pathological changes in chicks inoculated with the picornavirus "avian nephritis virus".
abstract: One-day-old chicks were inoculated intraperitoneally with a newly isolated picornavirus. The inoculated chicks showed no clinical signs until 28 days postinoculation (PI), but discoloration of the kidneys was recognized from 7 to 21 days PI at autopsy. Histologically, focal lesions were observed in the cortex of the kidneys from 3 to 21 days PI. The lesions were characterized by interstitial lymphocytic infiltration and degeneration of epithelial cells of the proximal convoluted tubules. The degenerated cells contained acidophilic granules in their cytoplasm. Electron-microscope examination of the cytoplasm revealed electron-dense amorphous areas, phagosomal areas with viral particles, and isolated crystal arrays of the virus particles, 23 to 30 nm in size. Granular antigen was also detected by fluorescent-antibody technique in the cells.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D000956:Antigens, Viral / Q000032:analysis; D002645:Chickens; D005455:Fluorescent Antibody Technique; D007668:Kidney / Q000276:immunology / Q000648:ultrastructure; D009393:Nephritis / Q000473:pathology / Q000662:veterinary*; D010849:Picornaviridae / Q000276:immunology; D010850:Picornaviridae Infections / Q000276:immunology / Q000473:pathology / Q000662:veterinary*; D011201:Poultry Diseases / Q000276:immunology / Q000473:pathology*
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral