Abstract
The immunogenicity of a novel particulate oral influenza vaccine was examined in terms of antibody response and protection in mice. Oral immunization with chicken erythrocytes (CRBC) adsorbed with gamma-irradiated influenza A virus induced high levels of immunoglobulin G antibodies and protection in the lung compared with gamma-irradiated virus administered alone or CRBC. Immunoglobulin A antibodies were the predominant antibodies in nasal washings, and their presence did not correlate with protection as well as immunoglobulin G antibodies. Immunity was not specific for the immunizing virus subtype, as antibodies and enhanced lung clearance of virus were demonstrated with different virus subtypes. However, mice were not protected when challenged with live influenza B virus. The antibody response and the degree of protection were dependent on both the concentration of virus adsorbed to CRBC and number of CRBC adsorbed to virus. Virus-adsorbed CRBC given subcutaneously failed to induce antibodies or protection. Oral immunization with A/Qld/6/72 (H3N2) virus gave a high level of protection over 12 weeks, which could be demonstrated with different subtypes. Protection correlated with antibody levels in the lung determined by both enzyme-linked immunosorbent and hemagglutination inhibition assays, although the levels detected by the latter declined over time.
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Selected References
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