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Geometric mean titer (GMT) and 95% confidence interval of hemagglutination inhibition (HAI) and microneutralization (MN) antibodies after vaccination with 15 μg or 30 μg hemagglutinin (HA), stratified by CD4 cell count. P value reflects the comparison between the antibody GMT after receipt of 15 μg or 30 μg HA at the specified time point.
