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HI antibody GMTs stratified by age (per-protocol immunogenicity sub-cohort). Footnote: CI, confidence interval; GMT, geometric mean titer; QIV, inactivated quadrivalent influenza vaccine; TIV-Vic, inactivated trivalent influenza vaccine Victoria lineage B strain; TIV-Yam, inactivated trivalent influenza vaccine Yamagata lineage B strain.
