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Frequencies of H1N1 split antigen specific CD4+ T-cells identified as expressing 2 or more markers among CD40L, IL-2, IFN-γ, TNF-α, and IL-13 per million of CD4+ T-cells at pre-vaccination, Day 21, Day 42, and Month 12 in (A) Study A and (B) Study B (sub-cohort of the according to protocol cohort for persistence at Month 12). Footnote: IL-2 = interleukin-2, TNF-α = tumor necrosis factor α, IFN-γ = gamma interferon, IL-13 = interleukin-13.
