T cell subsets in the NVS and controls. PBMCs were divided into 2 groups and stained with either CD3 (PerCP), CD4 (APC), CD45RA (FITC), and CCR7 (PE); or CD3 (PerCP), CD8 (APC), CD45RA (FITC), and CCR7 (PE). After gating on the lymphocyte population (Forward Scatter vs. Side Scatter), either the CD3+CD4+ or CD3+CD8+ were analyzed for subsets based on CCR7 and CD45RA. Naïve Cells=CD45+CCR7+; Central Memory Cells=CD45-CCR7+; Effector Memory Cells=CD45-CCR7−; Terminally Differentiated Cells=CD45+CCR7−. mono= mono-infected