| virus of the 1918 influenza pandemic era: new evidence about its antigenic character. | in serums of unusually isolated pacific islanders whose only exposure to influenza occurred during the era of the 1918 pandemic the residual neutralizing antibody was greatest to the pr/8 and bh strains of human type a influenza virus, significantly lower to swine influenza virus, and absent to equine or later human type a virus strains. the pandemic virus was thus antigenically closer to human type a strains isolated during the middle 1930's than to other known influenza virus types. | 1969 | 4897391 |