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Infection with influenza increases H1 serum IgA antibody responses. Healthy adult human volunteers were infected intranasally with different doses of H1N1 influenza. H1 specific IgA responses were measured by ELISA in serum on day-1 and day 29 of infection and presented as absolute values (A) and fold change based on the infecting dose (B). Serum IgA and IgG were compared at day-1 (C) and day 29 (D). Data from a single study n = 29 volunteers.
