Phase Ib Trial of Two Virosome Formulated Malaria Vaccine Components (PEV 301, PEV 302) in Tanzania

Inclusion Criteria: 1. Male volunteers aged between 18 and 45 years for the adult group, and children of both sexes aged 5-9 years for schoolchildren group 2. Written informed consent obtained from the volunteer (adult) or guardian/ legal representative (children). In case patient is illiterate, an impartial witness should be present during the entire consent procedure 3. Free of obvious health problems as established by medical history and clinical examination before entering the study 4. Body Mass Index between 18 and 30 for adults; MUAC less than 12 for children Exclusion Criteria: 1. Use of any investigational or non-registered drug or vaccine within 30 days preceding the first dose of study vaccine, or planned use during the study period and safety follow-up 2. Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying drugs within six months prior to the first vaccine dose 3. Any chronic drug therapy to be continued during the study period 4. Any confirmed or suspected acquired immunosuppressive or immunodeficient condition, including human immunodeficiency virus (HIV) infection, or history of congenital or hereditary immunodeficiency 5. History of allergic disease or reactions likely to be exacerbated by any component of the vaccine 6. Acute disease at the time of enrollment. Acute disease is defined as the presence of a moderate or severe illness with or without fever (defined as temperature more than 37.5°C) 7. Acute or chronic, clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by physical examination or laboratory screening tests 8. Acute or chronic diabetes 9. History of chronic alcohol consumption and/or intravenous drug abuse