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Altered 2011 H1N1 anti-influenza IgG1–4 responses after influenza vaccination during pregnancy. IgG1 (A), IgG2 (B), IgG3 (C), and IgG4 (D) mean antibody titers at 28 days after influenza vaccination comparing pregnant women based on gestational week, with non-pregnant controls at gestational week zero using linear regression models. R2 and p values are shown.
