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Immune responses after vaccination as measured by hemagglutination-inhibition (HI) assay
aWith use of bootstrap-adjusted p-value for pairwise comparisons, the p-value for the difference between group A and group B was .001 and between group A and group D was .019, whereas the difference between group A and group C was not statistically significant (p = .113).
Abbreviation: CI, confidence interval.
