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Immunity in humans with annual vaccination does not provide effective protection against antigenically distinct strains. As an approach to improve cross-protection in the presence of pre-existing strain-specific immunity, we investigated the efficacy of heterologous and heterosubtypic protection in previously vaccinated mice at earlier times after subsequent immunization with conserved-antigenic target...
The influenza M2 ectodomain (M2e) is poorly immunogenic and has some amino acid changes among isolates from different host species. We expressed a tandem repeat construct of heterologous M2e sequences (M2e5x) derived from human, swine, and avian origin influenza A viruses on virus-like particles (M2e5x VLPs) in a membrane-anchored form. Immunization of mice with M2e5x VLPs induced protective antibodies...
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