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Equivalent RSV-specific antibody levels in plasma of young and elderly donors. (A) RSV-specific antibody titers in plasma from young (n = 30) and elderly (n = 30) donors were compared by microneutralization of GFP-RSV A2 virus. (B) F-specific IgG ELISA. (C) Correlation analysis between neutralizing antibody titers and F-specific IgG titers. (D) RSV F-specific and total IgA titers in nasal washes of young (n = 10) and elderly (n = 20) adults.
