201. High immune efficacy against different avian influenza H5N1 viruses due to oral administration of a Saccharomyces cerevisiae-based vaccine in chickens.
- Author
-
Lei H, Lu X, Li S, and Ren Y
- Subjects
- Administration, Oral, Animals, Antibodies, Viral immunology, Chickens virology, Immunity, Mucosal drug effects, Immunoglobulin A immunology, Immunoglobulin G immunology, Influenza A Virus, H5N1 Subtype genetics, Influenza Vaccines genetics, Influenza Vaccines immunology, Influenza in Birds immunology, Poultry Diseases immunology, Chickens immunology, Influenza A Virus, H5N1 Subtype immunology, Influenza Vaccines pharmacology, Influenza in Birds prevention & control, Poultry Diseases prevention & control, Saccharomyces cerevisiae genetics, Saccharomyces cerevisiae immunology
- Abstract
A safe and effective vaccine is the best way to control large-scale highly pathogenic avian influenza virus (HPAI) A (H5N1) outbreaks. Saccharomyces cerevisiae (S. cerevisiae) is an ideal mucosal delivery vector for vaccine development, and we have previously shown that conventional administration of a S. cerevisiae-based vaccine (EBY100/pYD1-HA) via injection led to protection against the homologous H5N1 virus in a mouse model. Because the diameter of S. cerevisiae is approximately 10 μm, which results in a severe inflammation by injection route, therefore, oral administration is a more suitable approach for EBY100/pYD1-HA conferring protection in poultry. We extended our work by evaluating the immunogenicity and protective efficacy of oral vaccination with EBY100/pYD1-HA in the chicken model. Oral immunization with EBY100/pYD1-HA could induce robust serum IgG, mucosal IgA and cellular immune responses. Importantly, EBY100/pYD1-HA provided protection against challenges with a homologous and a heterologous H5N1 viruses. These findings suggest that EBY100/pYD1-HA, a promising H5N1 oral vaccine candidate, can avoid potential reassortment of other avian influenza viruses in oral administration of live virus vaccines and overcome the limitations of conventional injection routes. Importantly, this platform will be able to provide opportunities for broader applications in poultry during HPAI A (H5N1) outbreaks.
- Published
- 2021
- Full Text
- View/download PDF