Efficacy, Immunogenicity and Safety Study of GSK Biologicals' Candidate Malaria Vaccine Evaluating Different Dose Schedules in a Sporozoite Challenge Model in Healthy Malaria-naïve Adults

Subjects will receive intramuscular injection of RTS,S/AS01E.

Subjects will receive intramuscular injection of RTS,S/AS01B.

"Mosquitoes infected approximately 2-3 weeks earlier that are likely to contain sporozoites in their salivary glands will be allowed to feed on the subjects. For each subject, five mosquitoes will be allowed to feed over five minutes, after which they will be dissected to confirm how many were infected, and the salivary glands scored. If required additional mosquitoes will be allowed to feed until a total of five infected mosquitoes with a minimum of 2+ salivary gland scores have fed.~The challenge occurs approximately 90 days (three months) after the last vaccination.~Subjects will be monitored during 28 days after having bitten by mosquitoes and when parasites are found in their blood, they will be treated with appropriate anti-malarial drugs."