Fig. 2.

Responders to measles revaccination exhibit a trend towards a diminished frequency of activated CD38⁺human leucocyte antigen D-related (HLA-DR)⁺CD4⁺ T cells compared to non-responders 1 year post-revaccination. (a) Gating strategy and representative flow cytometry plots for identifying CD38⁺HLA-DR⁺CD4⁺ T cells in peripheral blood mononuclear cells (PBMC). (b) Percentage of CD38⁺HLA-DR⁺CD4⁺ at 1 year post-revaccination. Each dot represents one individual. Data are presented as mean of 10 responders and nine non-responders. Statistics were conducted using a two-tailed Student's t-test; *P < 0·05.