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Some experts argue that PI-based antiretroviral regimens lead to greater CD4-cell increases than do other combinations. Support for this argument comes in part from ACTG 5142, in which patients treated with lopinavir/ritonavir gained significantly more CD4 cells during a 48-week period than did those treated with efavirenz, even though the efavirenz group had a higher rate of virologic response (JW Infect Dis May 14 2008). Now, investigators have evaluated this issue among 3293 patients in the Swiss HIV Cohort Study. All the patients initiated their first combination regimens between 1996 and mid-2007. Most such regimens included unboosted PIs (78.7%) rather than NNRTIs (13.7%) or ritonavir-boosted PIs (7.6%) — a pattern quite different fro…