EBA-175 RII-NG Malaria Vaccine Administered Intramuscularly in Semi-immune Adults

2014-08-27 03:17:31 | BioPortfolio


Malaria is caused by a germ that people get from the bites of some mosquitoes. It kills over 2 million people each year. Many of the drugs used to treat malaria do not work as well as they used to and researchers are exploring other vaccines to prevent malaria. The purpose of this study is to learn if the vaccine, called EBA-175 RII-NG, is safe and if it strengthens the body's defenses against malaria. Participants will include 60 healthy adults, ages 18-40, recruited from Accra, Ghana. Several dosages of the vaccine will be tested for safety. The lowest dosages of the vaccine will be tested before the next higher dose is tested. There will be two groups for each dose, one group will receive the vaccine and the other group will receive a placebo (salt water solution). Participants may be involved in study related procedures for up to 398 days.


Malaria accounts for 500 million febrile illnesses and more than a million deaths annually. The disease burden is heaviest in economically developing countries where it is estimated that up to 5 percent of the gross domestic product of sub-Saharan countries is consumed by the direct and indirect health costs of malaria. Researchers propose to conduct a Phase I dosage-escalating study to assess the safety and immunogenicity of 3 different dosages of erythrocyte-binding antigen 175 kDA region II-nonglycosylated (EBA-175 RII-NG) recombinant Plasmodium falciparum (Pf) vaccine adjuvanted with Adju-Phos (aluminum phosphate adjuvant): 5, 20, and 80 micrograms (mcg), given in 3 doses at 0, 1, and 6 months by intramuscular (IM) injection to healthy young adults in a malaria endemic area (semi-immune adults). One dose of vaccine will be given at each time point. The primary objective is to assess the safety and reactogenicity (tolerability) of ascending dosages of EBA-175 RII-NG vaccine among healthy subjects given in 3 IM doses at 0, 1 and 6 months. The secondary objective is to evaluate the immunogenicity of the EBA-175 RII-NG vaccine by measuring anti-EBA-175 RII-NG antibodies using enzyme-linked immunosorbent assay (ELISA), inhibition of Plasmodium falciparum growth in vitro, and inhibition of binding of EBA-175 RII-NG to red blood cells (RBCs). Participants will include 60 malaria semi-immune healthy subjects between the ages of 18 and 40 years, males and females, recruited from Accra, Ghana. Subjects will be randomized to receive 3 doses of the vaccine or saline placebo by the intramuscular route in a 9:1 ratio at 0, 1 and 6 months. The safety and immunogenicity of ascending dosages of the vaccine will be assessed. Eighteen subjects will receive vaccine at each of the following dosage levels: 5, 20, and 80 mcg. Two subjects will receive placebo for each dosage level. Dosage escalation will proceed only after review of the 2-week safety data of the 2 initial doses of the prior dosage level.

Study Design

Allocation: Randomized, Endpoint Classification: Safety Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator, Outcomes Assessor), Primary Purpose: Prevention


Plasmodium Falciparum Malaria


EBA-175 RII-NG Malaria Vaccine, Placebo


Noguchi Memorial Institute of Medical Research




National Institute of Allergy and Infectious Diseases (NIAID)

Results (where available)

View Results


Published on BioPortfolio: 2014-08-27T03:17:31-0400

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Medical and Biotech [MESH] Definitions

A species of protozoa that is the causal agent of falciparum malaria (MALARIA, FALCIPARUM). It is most prevalent in the tropics and subtropics.

Malaria caused by PLASMODIUM FALCIPARUM. This is the severest form of malaria and is associated with the highest levels of parasites in the blood. This disease is characterized by irregularly recurring febrile paroxysms that in extreme cases occur with acute cerebral, renal, or gastrointestinal manifestations.

Malaria caused by PLASMODIUM VIVAX. This form of malaria is less severe than MALARIA, FALCIPARUM, but there is a higher probability for relapses to occur. Febrile paroxysms often occur every other day.

A protozoan disease caused in humans by four species of the PLASMODIUM genus: PLASMODIUM FALCIPARUM; PLASMODIUM VIVAX; PLASMODIUM OVALE; and PLASMODIUM MALARIAE; and transmitted by the bite of an infected female mosquito of the genus ANOPHELES. Malaria is endemic in parts of Asia, Africa, Central and South America, Oceania, and certain Caribbean islands. It is characterized by extreme exhaustion associated with paroxysms of high FEVER; SWEATING; shaking CHILLS; and ANEMIA. Malaria in ANIMALS is caused by other species of plasmodia.

A genus of protozoa that comprise the malaria parasites of mammals. Four species infect humans (although occasional infections with primate malarias may occur). These are PLASMODIUM FALCIPARUM; PLASMODIUM MALARIAE; PLASMODIUM OVALE, and PLASMODIUM VIVAX. Species causing infection in vertebrates other than man include: PLASMODIUM BERGHEI; PLASMODIUM CHABAUDI; P. vinckei, and PLASMODIUM YOELII in rodents; P. brasilianum, PLASMODIUM CYNOMOLGI; and PLASMODIUM KNOWLESI in monkeys; and PLASMODIUM GALLINACEUM in chickens.

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