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Influenza-specific IgM (A) and IgG (B) reactivity were measured in elderly individuals in the sedentary (SE) and physically active (PA) groups, each divided into negative (N) and positive (P) subgroups, on two different occasions: before and 30 days after influenza virus vaccination. Significance level: *p < 0.05, **p < 0.01 and ***p < 0.001.
