IL6 and AIDS: To investigate the potential role of circulating LPS in triggering Mo activation, plasma LPS levels together with soluble markers of Mo activation (i.e., sCD14 [3], IL-6, and CCL2 [28]) were compared between AIDS patients classified according to NCI diagnoses into 5 groups (No NCI, HAD, MCMD, neuropsychiatric impairment due to cause other than HIV (NPI-O), and ANI).