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MN titers to A/H1N1/California/2009 (pH1N1) (A), A/H3N2/Victoria/2011 (B), and B/Wisconsin/2010 (C) before (Day 0) and after (Day 28) IIV administration in pregnant and control women. Titers are the reciprocal of the highest serum dilution factor with less than 50% infection, normalized to positive controls. Lines connect data points from individuals. Data points represent average of technical replicates. Abbreviations: IIV, inactivated influenza vaccine; MN, microneutralization.
