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To understand the reported cross-reactivity of the 2009 H1N1 and the 1918 H1N1 pandemic viruses we docked the crystal structure of 2D1, an antibody derived from a survivor of the 1918 pandemic, to the structures of hemaglutinin (HA) of the 2009 strain and seasonal H1 vaccine strains. Our studies revealed that 2D1 binds to the 2009 HA at antigenic site 'Sa', with stabilizing contacts, similar to that in an available co-crystal structure of 2D1-1918 HA. However, 2D1 failed to bind to the known antigenic sites in the HAs of seasonal strains. Our study thus reveals the molecular basis for pre-existing immunity in elderly people to the 2009 pandemic virus.

Antigen-Antibody docking reveals the molecular basis for cross-reactivity of the 1918 and 2009 Influenza A/H1N1 pandemic viruses