Abstract
Current influenza vaccines preferentially generate B-cell responses to the variable hemagglutinin (HA) head. Focusing vaccine-induced antibody responses on epitopes in the conserved HA stem may provide better protection against future drifted and pandemic strains. Understanding the basis for the dominant HA head and subdominant HA stem-specific responses at the level of B-cell activation and differentiation will be critical for designing vaccines that induce sustained stem-specific responses. Identifying antibody lineages with broad neutralizing activity against influenza A viruses and defining the structural mode of recognition for germline precursors of those antibodies will also guide future immunogen design.
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