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CGD Policy Blogs


A Reflection on the AIDS Vaccine Trial: What's the Real Failure?

"Disappointing" is the only word to describe the news that sponsors of the STEP study, testing Merck's AIDS vaccine candidate, have discontinued the Phase IIb trial. Interim analyses showed that the product doesn't prevent infection or reduce the presence of HIV in the blood once someone is infected, calling a halt to tests of the most promising candidate in the field.