CD4 and infection: In each case, levels varied following infection and the pattern differed between the groups, although both groups exhibited peaks at day 2 PI in CD69+CD4+ (lean p=0.0002 vs B and obese p=0.0005 vs B) and CD69+CD8+ T cells (lean p=0.0003 vs B and obese p=<0.0001 vs B) and at day 3 PI in CD38+CD4+ T cells (lean p=0.0011 vs B and obese p=<0.0001 vs B).