ATLANTA—Efficacy of the RTS,S malaria vaccine for children — vaccinated between six and 12 weeks age — checked-in at around 30 per cent in preliminary findings from Africa released at the American Society of Tropical Medicine and Hygiene conference by Dr John Lusingu of Tanzania’s National Institute of Medical Research. He told Sarah Maxwell that although this figure is lower than was hoped the data mean that a third of all cases of malaria are prevented among vaccinated children. Professor Sir Brian Greenwood of the London School of Hygiene & Tropical Medicine added his comment.