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Reduced 2011 H1N1 hemagglutination inhibition (HAI) titers after influenza vaccination during pregnancy. 2011 H1N1 HAI geometric mean titers 28 days after influenza immunization comparing pregnant women with not pregnant controls (A), or by linear regression for pregnant women based on gestational week, with not pregnant controls at gestational week zero (B). R2 and p values are shown.
