An anonymous reader writes "According to a report in Reuters, scientists are celebrating the end of a clinical trial which found a malaria vaccine reduces infection risk by half in children. From the article: 'While scientists say it is no "silver bullet" and will not end the mosquito-borne infection on its own, it is being hailed as a crucial weapon in the fight against malaria and one that could speed the path to eventual worldwide eradication. Malaria is caused by a parasite carried in the saliva of mosquitoes. It kills more than 780,000 people per year, most of them babies or very young children in Africa. Cohen's vaccine goes to work at the point when the parasite enters the human bloodstream after a mosquito bite. By stimulating an immune response, it can prevent the parasite from maturing and multiplying in the liver. ... Cohen said that if all goes to plan, RTS,S could be licensed and rolled out by 2015.'"