Sustained CD4 responses after virological failure of protease inhibitor-containing therapy.

This article explores current controversies related to 'discordant' responses to antiviral therapy, that is to say, patients with a sustained CD4 cell response despite virological failure. Observational clinical data of patients receiving protease inhibitor-based therapy who had a sustained CD4 cell count even with incomplete viral suppression will be presented, as well as possible mechanisms and clinical implications.