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The CD4-cell count has been a pivotal tool in HIV care since the late 1980s, when it first achieved its reputation as a reliable and convenient objective marker of immune deficiency. And now, hard as it may be to believe, we may not need it any more — at least not in the care of stable patients.
To explore this possibility, investigators probed the records of all patients attending a single HIV clinic in Washington, D.C., at any time from September 1998 through December 2011 to identify those with continuous long-term HIV suppression. Among patients with CD4 counts between 200 and 249 cells/mm3 at the start of suppression, risk for a subsequent CD4 dip to <200 cells/mm3 was 25%; among those with counts between 250 and 299, risk was 16%; amon…