Percentage of CD4⁺ (A) and CD8⁺ lymphocytes (B) expressing membrane-bound (m)TNF-α and mTNFRs (p55- and p75-TNFR) were analyzed by flow cytometry in five symptomatic non-AIDS HIV-1–infected patients (CDC group B), five AIDS patients (CDC group C), and seven healthy controls. *P < .05 versus controls, **P < .01 versus controls, and ^ρP < .05 versus CDC group C. Data are given as medians and 25th to 75th percentiles.