title: Immune responses and protective efficacy of a recombinant swinepox virus expressing HA1 against swine H1N1 influenza virus in mice and pigs.
abstract: Swine influenza virus (SIV) is not only an important respiratory pathogen in pigs but also a potent threat to human health. Although immunization with recombinant poxviruses expressing protective antigens as vaccines has been widely used for against many infectious diseases, development of recombinant swinepox virus (rSPV) vector for the purpose has been less successful. Here, we report the construction of a recombinant swinepox virus (rSPV-HA1) expressing hemagglutinin (HA1) of H1N1 SIV. Immune responses and protection efficacy of the vaccination vector were evaluated in both the mouse model and the natural host: pig. Prime and boost inoculations of rSPV-HA1 yielded high levels of neutralization antibody against SIV and elicited potent H1N1 SIV-specific IFN-γ response from T-lymphocytes. Complete protection of pigs against H1N1 SIV challenge was observed. No pigs showed evident systemic and local reactions to the vaccine and no SIV shedding was detected from pigs vaccinated with rSPV-HA1 after challenge. Our data demonstrated that the recombinant swinepox virus encoding HA1 of SIV H1N1 may serve as a promising SIV vaccine for protection against SIV infection.
authors.affiliation: College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Jiarong
authors.initials: J
authors.lastname: Xu
authors.forename: Dongyan
authors.initials: D
authors.lastname: Huang
authors.forename: Shichao
authors.initials: S
authors.lastname: Liu
authors.forename: Huixing
authors.initials: H
authors.lastname: Lin
authors.forename: Haodan
authors.initials: H
authors.lastname: Zhu
authors.forename: Bao
authors.initials: B
authors.lastname: Liu
authors.forename: Chengping
authors.initials: C
authors.lastname: Lu
mesh_terms: D000818:Animals; D057134:Antibodies, Neutralizing / Q000097:blood; D000914:Antibodies, Viral / Q000097:blood; D004195:Disease Models, Animal; D005822:Genetic Vectors; D019267:Hemagglutinin Glycoproteins, Influenza Virus / Q000235:genetics / Q000276:immunology*; D007117:Immunization, Secondary / Q000379:methods; D053118:Influenza A Virus, H1N1 Subtype / Q000235:genetics / Q000276:immunology*; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology*; D007371:Interferon-gamma / Q000378:metabolism; D051379:Mice; D009976:Orthomyxoviridae Infections / Q000517:prevention & control; D018148:Suipoxvirus / Q000235:genetics*; D013552:Swine; D013601:T-Lymphocytes / Q000276:immunology; D014614:Vaccines, Synthetic / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology
chemical_list: D057134:Antibodies, Neutralizing; D000914:Antibodies, Viral; D019267:Hemagglutinin Glycoproteins, Influenza Virus; D007252:Influenza Vaccines; D014614:Vaccines, Synthetic; D007371:Interferon-gamma