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Post-vaccination 4-fold rises, by assays and influenza vaccine strains. All data points shown are the proportion (%) out of 150. Risk difference is defined as the difference between LAIV and the placebo. Abbreviations: HAI, hemagglutination inhibition assay; IgA, immunoglobulin A assay; IgG, immunoglobulin G assay; LAIV, live, attenuated influenza vaccine; MN, microneutralization assay.
