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Microneutralization (MN) and hemagglutination inhibition (HAI) seroconversion rates and 95% confidence interval after vaccination with 15 μg or 30 μg hemagglutinin (HA) for the study population and stratified by CD4 cell count. P value reflects the comparison between the seroconversion rates following receipt of 15 μg or 30 μg HA at the specified time point.
