Journal
ARCHIVES OF VIROLOGY
Volume 157, Issue 8, Pages 1451-1461Publisher
SPRINGER WIEN
DOI: 10.1007/s00705-012-1318-7
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Funding
- National High Technology Research and Development Program of China (863 Program) [2010AA022905, 2010AA022908]
- National 973 Project [2010CB530301]
- National Natural Science Foundation of China [81071346, 81172738]
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Our previous studies have proven the adjuvanticity of chitosan in mice when administered with inactivated and subunit influenza vaccine. In this study, we investigated the adjuvant effect of chitosan on the immunogenicity and protective efficacy of a live attenuated influenza vaccine. Mice were inoculated intranasally with live attenuated influenza vaccine plus chitosan and then challenged with a high, lethal dose of homologous or heterologous virus. Antibody responses, secretion of IFN-gamma by spleen cells, body weight loss, survival rates, and residual lung virus titers were tested. The results demonstrated that live attenuated influenza vaccine with chitosan adjuvant not only protected mice completely against challenge with the homologous virus but also provided good cross-protection against a heterologous virus. In addition, chitosan as adjuvant could significantly increase the levels of antigen-specific antibodies and the population of IFN-gamma-secreting T cells. These results reveal the potential of chitosan as a candidate adjuvant for use in a live attenuated influenza vaccine.
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