Naïve and memory T cells subsets.

<p>(A) Gating strategy for CD4+ and CD8+ T cell subsets analysis (B) Proportion of CD4+ and CD8+ T-cell subsets in Responder and Non Responder individuals. Immunological parameters analyzed in vaccine recipients are shown at baseline and after the booster HBV vaccine dose (T1 and T6). Mean values and statistically significant differences are indicated. NS, not significant. CM, central memory; EM, effector memory; TD, terminally differentiated.