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Geometric mean hemagglutination inhibition titers of pregnant women and their infants. Titers and 95% confidence intervals at study entry; 21 days after the first dose of pH1N1 vaccine; 10 and 21 days after the second dose of vaccine; delivery; and 3 and 6 months postpartum are shown. Abbreviations: CI, confidence interval; HAI, hemagglutination inhibition.
