The VP1 protein of avian encephalomyelitis virus is a major host-protective immunogen that serves as diagnostic potential.
Avian encephalomyelitis virus (AEV) is an important pathogen of poultry and is classified as a member of Picornaviridae. To investigate the protective immunity induced by AEV structural proteins, recombinant VP1, VP0, and VP3 proteins were expressed in a baculovirus system. The result of in vivo protection assays shows that the VP1 protein is a major host-protective immunogen against AEV challenge and demonstrates further that the antibody raised against VP1 protein could neutralize more effectively AEV infection than antibody against VP3 or VP0 protein in a virus neutralization test. These purified recombinant proteins were subsequently evaluated as enzyme-linked immunosorbent assay (ELISA) antigens for detection of AEV infection. A total number of 50 positive sera and 30 negative sera were tested for ELISA validation. Results obtained by testing 193 sera from chickens suspected of being infected AEV further showed that the diagnostic sensitivities of the VP1, VP3, and VP0 protein-based ELISAs were 98.1, 80.6, and 51.9%, and their specificities were 100, 87.9, and 81.8%, respectively. Both sensitivity and specificity of the VP1 protein-based ELISA were comparable with a commercially available test, indicating that the VP1 protein has a highly promising and reliable diagnostic potential, and thus is a suitable antigen for ELISA detection of AEV antibodies in chickens.
Wei
Li
L
Institute of Animal Husbandry and Veterinary Medicine, Beijing Municipal Academy of Agriculture and Forestry Sciences, No. 9 Shuguang Garden Central Road, Haidian District, Beijing 100097, People's Republic of China.
Chee
Li Lian
LL
Wei
Ting
T
Kwang
Jimmy
J
Zhou
Jiao
J
Wang
Jing
J
Shi
Lei
L
Liu
Jue
J
D000818:Animals; D000914:Antibodies, Viral / Q000097:blood / Q000276:immunology*; D002645:Chickens / Q000276:immunology / Q000821:virology; D001350:Encephalomyelitis Virus, Avian / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D010850:Picornaviridae Infections / Q000175:diagnosis / Q000276:immunology / Q000517:prevention & control / Q000662:veterinary*; D011201:Poultry Diseases / Q000175:diagnosis / Q000276:immunology* / Q000517:prevention & control; D011994:Recombinant Proteins / Q000276:immunology; D012680:Sensitivity and Specificity; D015678:Viral Structural Proteins / Q000276:immunology*
D000914:Antibodies, Viral; D011994:Recombinant Proteins; D015678:Viral Structural Proteins