Experimental Vaccine for Malaria in Adults in Mali
This study will determine the highest dose of an experimental vaccine called AMA1-C1 that can safely be given to adults exposed to malaria. Malaria affects about 300 million to 500 million people worldwide each year, causing from 2 million to 3 million deaths, mostly among children under 5 years of age in sub-Saharan Africa. It is the leading cause of death and illness among the general population of Mali in West Africa. Increasing drug resistance to the malaria parasite, as well as widespread resistance of mosquitoes (the insects that transmit the parasite) to pesticides are reducing the ability to control malaria through these strategies. A vaccine that could reduce illness and death from malaria would be a valuable new resource in the fight against this disease. AMA1-C1 is an experimental vaccine developed by the NIAID. Early tests of AMA1-C1 in 30 healthy people in the United States found no serious harmful side effects of the vaccine. This study will look at the effect of AMA1-C1 in people in Mali who have been exposed to malaria.
Residents of Don gu bougou, Mali, who are between 18 and 45 years of age and are in general good health may be eligible for this study. Candidates are screened with a medical history and physical examination, blood and urine tests, and urine pregnancy test for women.
Participants are randomly assigned to receive three injections (shots) of either the experimental malaria vaccine or a hepatitis B vaccine that is approved and used in Mali. All shots are given in an upper arm muscle. After the first shot, the second is given 1 month later, and the third is given 12 months after the first. Subjects receiving AMA1-C1 will get one of three different doses - low, medium, or high - to find the dose that is safest and gives the best antibody response to the vaccine. After each shot, participants remain in the clinic for 30 minutes for observation. They return to the clinic 1, 2, 3, 7, and 14 days after each shot for a physical examination and to check for side effects. Blood samples are drawn before each shot and at selected return clinic visits to check for side effects and to measure the effect of the vaccine.
During the rainy seasons after the second and third vaccinations, subjects come to the clinic once a month for an examination and a blood test. During the dry season, subjects come to the clinic 3 months before the last shot is given for an examination and blood test. Additional blood tests may be done on participants who develop malaria.
If found to be safe in adults, further studies with this vaccine will be done in children exposed to malaria, as it is children who bear the brunt of this disease.
Plasmodium Falciparum Malaria
Drug: AMA1-C1/alhydrogel Malaria Vaccine
|Study Design:||Primary Purpose: Treatment|
|Official Title:||Double-Blind, Randomized, Controlled, Phase 1 Study of the Safety and Immunogenicity of AMA1-C1/Alhydrogel Vaccine for Plasmodium Falciparum Malaria, in Semi-Immune Adults in Doneguebougou, Mali|
|Study Start Date:||April 23, 2004|
|Estimated Study Completion Date:||January 22, 2008|
Please refer to this study by its ClinicalTrials.gov identifier: NCT00343005
|Malaria Research and Training Center (MRTC)|