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Table 1 Proportion of subjects with HAI ≥:1:40 at baseline (S1), 28 days post-vaccination (S2), and after influenza season (S3) and with seroconversion at S2, by influenza strain

From: Factors associated with maintenance of antibody responses to influenza vaccine in older, community-dwelling adults

Seroprotection H1N1 H3N2 B
% (N) % (N) % (N)
Baseline (S1) 9% (44) 48% (235) 43% (214)
28 days post-vaccination (S2) 26% (126) 82% (407) 72% (354)
After influenza season (S3) 9% (46) 59% (289) 53% (263)
Seroconversion    
28 days post-vaccination (S2) 12% (60) 45% (222) 28% (138)