title: Further studies on in vitro and in vivo assays of hemorrhagic enteritis virus (HEV).
abstract: Isolation of hemorrhagic enteritis virus (HEV) from spleens of infected turkeys in the MDTC-RP19 lymphoblastoid cell line was compared with detection of HEV antigen in the same spleens using the agar gel precipitation (AGP) test. A concordance of 80% was found between the two assays. Virus isolation had a sensitivity of 84% and a specificity of 88% compared with the AGP test. RP19 cells were also susceptible to infection with several other avian adenoviruses, but such infection was easily differentiated from that of HEV by a fluorescent-antibody (FA) test. Turkeys required 10(2) tissue-culture-infectious doses (TCID) to develop HE-specific lesions and 10(5) TCID to be killed. On the other hand, as little as 10 TCID of apathogenic HEV protected the poults against challenge with virulent HEV. The enzyme-linked immunosorbent assay (ELISA) for detection of HEV antibody was improved by using virus-infected RP19 cells as antigen. The ELISA appears to be more sensitive than the serum-neutralization test.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D000259:Aviadenovirus / Q000254:growth & development; D002460:Cell Line; D003332:Coronaviridae / Q000302:isolation & purification*; D004752:Coronavirus, Turkey / Q000276:immunology / Q000302:isolation & purification*; D003588:Cytopathogenic Effect, Viral; D004753:Enteritis, Transmissible, of Turkeys / Q000382:microbiology*; D004797:Enzyme-Linked Immunosorbent Assay; D005455:Fluorescent Antibody Technique; D009500:Neutralization Tests; D013154:Spleen / Q000382:microbiology; D014422:Turkeys
chemical_list: D000914:Antibodies, Viral