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Hemagglutination inhibition geometric mean titers (GMTs) against A/Indonesia/5/2005 H5N1 at day 0 through 42 according to age: (A) 18–40 years vs (B) 41–64 years. Data are presented for according-to-protocol cohort. Vaccine doses were administered at intervals of 21 days (group 0/21), 14 days (group 0/14), or 7 days (group 0/7) or on the same day (group 0/0). CI, confidence interval.
