title: Development and application of an indirect ELISA for detection of antibodies against avian hepatitis E virus.
abstract: An indirect enzyme-linked immunosorbent assay (iELISA) that could detect immunoglobulin G antibodies against avian hepatitis E virus (HEV) was developed. This assay employs a truncated C-terminal 268-amino acid recombinant ORF2 protein from an avian HEV genotype 3 strain isolated in China (CaHEV) as the coating antigen. The antigen concentration and serum dilution were optimized using a checkerboard titration. A cut-off value of 0.368 at OD(450nm) was determined by testing 120 positive and 200 negative chicken sera for avian HEV antibodies using the two-graph receiver operating characteristic (TG-ROC) analysis. This iELISA has a sensitivity of 96.1% and a specificity of 95.8%. The overall agreement between the iELISA and a corresponding Western blot was 97%. The iELISA was used to evaluate the seroprevalence of avian HEV in poultry farms in the Shandong province. The avian HEV seropositive rate of 35.9% was determined by testing 1871 serum samples that were collected from 10 chicken flocks ranged from 10 to 60 weeks of age. The iELISA that was developed in this study can be used for detection of immunoglobulin G antibodies against avian HEV.
authors.affiliation: College of Veterinary Medicine, Veterinary Immunology Research Institute of Northwest A & F University,Yangling, Shaanxi, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhao
authors.forename: Yani
authors.initials: Y
authors.lastname: Sun
authors.forename: Jinan
authors.initials: J
authors.lastname: Zhao
authors.forename: Shoubin
authors.initials: S
authors.lastname: Hu
authors.forename: Feifei
authors.initials: F
authors.lastname: Zhao
authors.forename: Fuyong
authors.initials: F
authors.lastname: Chen
authors.forename: Alfonso
authors.initials: A
authors.lastname: Clavijo
authors.forename: En-Min
authors.initials: EM
authors.lastname: Zhou
authors.forename: Yihong
authors.initials: Y
authors.lastname: Xiao
mesh_terms: D000818:Animals; D002645:Chickens; D002681:China; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods / Q000662:veterinary*; D006508:Hepatitis Antibodies / Q000097:blood*; D006524:Hepatitis, Viral, Animal / Q000175:diagnosis* / Q000276:immunology; D052678:Hepevirus / Q000276:immunology*; D007074:Immunoglobulin G / Q000097:blood*; D011201:Poultry Diseases / Q000276:immunology / Q000821:virology; D012327:RNA Virus Infections / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D016036:Seroepidemiologic Studies
chemical_list: D006508:Hepatitis Antibodies; D007074:Immunoglobulin G