We have examined human CD4+ T-cell recognition of influenza A/Beijing/32/92 (H3N2) virus hemagglutinin following influenza virus HANA subunit vaccination. CD4+ T-cell repertoires were dominated by recognition of epitopes located in conserved regions of the molecule, in a major histocompatibility complex class II haplotype-dependent manner, analogous to that observed following natural infection.
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Gelder et al. (1996) studied this question.
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