Hemagglutination inhibition response: MF59-adjuvanted H5N1 subunit influenza vaccine formulations and age cohort

Numbers in parenthesis are two-sided 95% confidence intervals; Seroprotection = HI titer ≥40; Seroconversion = negative pre-vaccination serum (i.e., HI titer <10) and post-vaccination HI titer ≥40 or significant increase (at least a fourfold increase in HI titer in subjects who were positive pre-vaccination, i.e., HI titer ≥10); HA, hemagglutinin; GMT, geometric mean titer; GMR, the geometric mean of the ratio over baseline.