Fig. 2From: Investigation of CD4 and CD8 T cell-mediated protection against influenza A virus in a cohort studyThe pre-existing CD4 responses among infected and uninfected individuals in the first pandemic wave of pH1N1 (A) and the five epidemics of pH1N1 (C, E) and H3N2 (B, D, F) in 2010–2013. Star indicates a statistically significant difference with a p-value < 0.05 by Wilcoxon the signed-rank test. The T cell response was measured using whole blood samples collected in R1, R3, R3, R5, R7, and R7 for A–F, respectivelyBack to article page