FOSTER CITY, Calif.--(BUSINESS WIRE)--Gilead Sciences, Inc. (Nasdaq:GILD) today announced Phase II clinical trial results showing that its investigational fixed-dose, single-tablet “Quad” regimen of elvitegravir, cobicistat and Truvada® (emtricitabine and tenofovir disoproxil fumarate) for the treatment of HIV infection maintained a high rate of virologic suppression through 48 weeks, exhibiting antiretroviral activity comparable to that of Atripla® (efavirenz 600 mg/emtricitabine 200 mg/ tenofovir disoproxil fumarate 300 mg). At week 48, the proportion of patients who achieved HIV RNA (viral load) less than 50 copies/mL was 90 percent in the Quad arm and 83 percent in the Atripla arm (using an analysis where missing equals failure). These data are being featured in a late-breaker poster presentation today at the 50th Annual Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC) in Boston (Abstract #H-938b).