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The association between age and baseline neutralizing antibody (nAb) titers against H3N2 vaccine and circulating viruses in influenza A virus (IAV)-positive patients. Baseline nAb titers for IAV-positive patients were graphed relative to patient age for (A) HK14, (B) HK14-like, (C) Balt17-2a2, and (D) Balt18-3a. The limit of detection (LOD) is labeled with a stippled line as is the cutoff titer for seroprotection (1:40). The r2 and P values for each virus are given.
