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Reverse cumulative distribution curves. The percent of individuals with (A) PVN IC95 and (B) NAI IC50 titers less than or equal to the shown titers is plotted for the H3N2+ (blue curve), housing (red curve), and H3N2− and housing control (light gray curve) groups. Differences between the groups and titers were analyzed using 2-way analysis of variance. P values <.05 were considered significant. Abbreviations: NAI, neuraminidase inhibition; PVN, pseudovirus neutralization.
