A vaccine previously shown to reduce malaria in young infants and children reduces larger numbers of malaria cases in areas of higher malaria transmission, according to results from an ongoing clinical trial published in PLOS Medicine. The effect of vaccination diminished over time, but protection against clinical malaria remained evident 18 months after vaccination. In the new report, the RTS, S Clinical Trials Partnership* update estimates of vaccine efficacy (the reduction in the risk of malaria in participants who received the vaccine compared to those who received a comparator vaccine) and calculate the number of cases of malaria that the vaccine prevented in a phase 3, randomized, controlled clinical trial of the malaria vaccine RTS, S/AS01 given to young infants and children in Africa

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