title: An enzyme-linked immunosorbent assay for detection of hemorrhagic enteritis virus and associated antibodies.
abstract: An enzyme-linked immunosorbent assay (ELISA) that detects antibodies specific for type II avian adenoviruses is described. Freon-treated extracts from spleens of hemorrhagic enteritis (HEV)-infected poults were a better source of antigen than the cell-culture-propagated virus. Antigen-coated microtiter wells treated with bovine serum albumin reduced nonspecific adsorption of immunoglobulins. The ELISA readily detected antibodies in hemorrhagic-enteritis- and marble-spleen-disease-infected field flocks of turkeys and pheasants. Antibody was also detected 1 week after vaccination of 2-week-old poults with cell-culture-prepared hemorrhagic enteritis vaccine. The assay was specific and more sensitive than agar-gel-precipitation and virus-neutralization tests. HEV-related antigens in infected spleens were also detected indirectly in a blocking ELISA by removal of HEV antibodies (Ab) from stock (Ab+) serum through antigen-antibody complex formation. Extracts from HEV-infected poults reduced specific antibody reactivities in HEV-antigen-coated wells, whereas extracts from HEV-challenged poults previously vaccinated with attenuated virus did not remove HEV antibodies.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D000956:Antigens, Viral / Q000032:analysis; D003332:Coronaviridae / Q000276:immunology*; D004752:Coronavirus, Turkey / Q000276:immunology*; D004753:Enteritis, Transmissible, of Turkeys / Q000175:diagnosis*; D004797:Enzyme-Linked Immunosorbent Assay; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis / Q000662:veterinary*; D007124:Immunoenzyme Techniques; D013154:Spleen / Q000276:immunology; D014422:Turkeys / Q000276:immunology; D014613:Vaccines, Attenuated / Q000276:immunology; D014765:Viral Vaccines / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D014613:Vaccines, Attenuated; D014765:Viral Vaccines