RTS,S Candidate Vaccine Reduces Malaria by One-Third in African Infants

Results from a pivotal, large-scale Phase III trial, published online on November 9, 2012 in the New England Journal of Medicine, show that the RTS,S malaria vaccine candidate can help protect African infants against malaria. When compared to immunization with a control vaccine, infants (aged 6-12 weeks at first vaccination) vaccinated with RTS,S had one-third fewer episodes of both clinical and severe malaria and had similar reactions to the injection. In this trial, RTS,S demonstrated an acceptable safety and tolerability profile. Eleven African research centers in seven African countries are conducting this trial, together with GlaxoSmithKline (GSK) and the PATH Malaria Vaccine Initiative (MVI), with grant funding from the Bill & Melinda Gates Foundation to MVI. Dr. Salim Abdulla, a principal investigator for the trial from the Ifakara Health Institute, Tanzania, said: "We've made significant progress in recent years in our battle against malaria, but the disease still kills 655,000 people a year—mainly children under five in sub-Saharan Africa. An effective malaria vaccine would be a welcome addition to our tool kit, and we've been working toward this goal with this RTS,S trial. This study indicates that RTS,S can help to protect young babies against malaria. Importantly, we observed that it provided this protection in addition to the widespread use of bed nets by the trial participants." When administered along with standard childhood vaccines, the efficacy of RTS,S in infants aged 6 to 12 weeks (at first vaccination) against clinical and severe malaria was 31% and 37%, respectively, over 12 months of follow-up after the third vaccine dose. Insecticide-treated bed nets were used by 86% of the trial participants, which demonstrated that RTS,S provided protection beyond existing malaria control interventions.
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