This study compared plasma bioavailable interleukin (IL)-6 levels in 3 groups: human immunodeficiency virus (HIV)-infected patients who had a human herpesvirus (HHV)-associated immune restoration disease (IRD) during highly active antiretroviral therapy (HAART); patients who experienced an IRD initiated by Mycobacterium avium complex, hepatitis C virus, or human papillomavirus; and control patients who had uneventful immune reconstitution. Total IL-6, soluble IL-6 receptor (sIL-6R), and soluble gp130 were measured by ELISA, and levels of free IL-6 and sIL-6/IL-6R complex were modeled mathematically. Persons who had an HHV-associated IRD had increased plasma bioavailable IL-6 before HAART, compared with patients who experienced a non-HHV-associated IRD and with control patients, and their plasma bioavailable IL-6 increased progressively over 3-4 years of treatment. Increased IL-6 production may be a feature of HAART-induced restoration of immune responses to HHV infections and may have long-term immunopathologic consequences.

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http://dx.doi.org/10.1086/323599DOI Listing

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