View clinical trials related to Malaria.
Filter by:This is a randomized, double-blind, controlled, which seeks to compare two groups of volunteers (naive and previously exposed to malaria) who were made 3 immunizations with a synthetic derivative of the CS protein of Plasmodium vivax in order to determine their protective efficacy. Then volunteers will be subject to an infectious challenge to assess the infectivity of gametocytes in the blood early stage of P. vivax in Anopheles albimanus mosquitoes.
Malaria, a disease caused by the parasite Plasmodium, is one of the world's major infectious diseases. With approximately 627.000 deaths a year, there is desperate need for an effective vaccine. Though a number of vaccine-candidates have been developed, they have yet to achieve the level of efficacy necessary to eliminate malaria. It has been shown previously that healthy human volunteers bitten by malaria-infected mosquitoes while taking chloroquine, medicine that prevents malaria, are fully protected against a subsequent malaria challenge. This is called CPS-immunization. The unprecedented effectiveness of CPS-immunization makes it a good model to identify what immune responses protect against malaria, to further guide vaccine development. In this study we will use CPS-immunization to induce protection against malaria in healthy subjects and then analyse their immune response to a malaria challenge infection.
This study will assess how the current VHV (VHV=CHW, community health worker) scope can be expanded to include iCCM and if such group interventions can provide improved access to treatment for children. In rural SW Uganda, can iCCM provided by lay volunteers, increase the proportion of children with diarrhoea receiving ORS/Zn, ARI receiving anti-biotics, and fever/malaria receiving anti-malarials?
The purposes of this study is to determine parasitological clearance rates by microscopy for the 72-hour period after first artesunate dose in subjects with uncomplicated P. falciparum malaria.
The purpose of this study is to evaluate an experimental malaria vaccine for its ability to prevent malaria infection or disease in a blood-stage challenge model (when volunteers are infected with malaria parasites using malaria-infected red blood cells). The vaccine being testing is a protein called FMP2.1, which is given with an adjuvant (a substance to improve the body's response to a vaccination) called AS01B. The aim is to use this protein and adjuvant to help the body make an immune response against parts of the malaria parasite. This study will enable assessment of: 1. The ability of the vaccine to prevent malaria infection. 2. The safety of the vaccine in healthy participants. 3. The response of the human immune system to the vaccine. This will be done by giving participants three vaccinations and then exposing them to malaria infection by transfusing a small number of red blood cells infected with malaria under carefully regulated conditions. Participants will be followed closely to observe if and when they develop malaria. If the vaccine provides some protection against malaria, participants will take longer to develop malaria than usual or will not develop malaria at all. The study will enrol 15 participants to be vaccinated and then challenged with malaria in addition to recruit 15 individuals to be control subjects.
Background: The World Health Organization recommends that antimalarial treatment policies be evaluated every few years to check their efficacy. P. vivax malaria is the most common species in Brazil and cases are concentrated in the Amazon Region in Brazil. Objectives: Assess the efficacy of chloroquine and primaquine for the treatment of P. vivax infections in Cruzeiro do Sul, Acre, Brazil. Methods: An in vivo drug efficacy study will be conducted in Cruzeiro do Sul, Acre State, Brazil. At least 117 study participants ≥5 years of age with parasitologically confirmed P. vivax monoinfections will be treated under supervision with chloroquine (CQ) for three days at a daily dose of approximately 25 mg/Kg in accordance with the Brazilian National Malaria Control guidelines. For patients with normal glucose 6 phosphate dehydrogenase activity levels, investigators will add primaquine at dose of 0.5mg/Kg per day for 7 days. Clinical and parasitologic parameters will be monitored over a 28-day follow-up period to evaluate drug efficacy and for a total period of 168 days (6 months) to evaluate chances of recrudescence, relapse, or reinfection. Blood samples will be taken to measure the CQ levels in blood on Day 7 and day of failure, if occurring in the initial 28 days of follow up. In addition, a blood sample will be collected on filter paper on first day and on day of suspected failure to help differentiate parasite genotypes using techniques based on polymerase chain reaction. Results from this drug efficacy study will be used to assist the Brazilian Ministry of Health in assessing their national malaria treatment policy for P. vivax malaria.
Background: - People bitten by mosquitoes carrying weakened malaria parasites could fight off the disease if later exposed to normal malaria parasites. Scientists have discovered how to make the weakened parasites, which can be injected by the PfSPZ vaccine. Researchers want to see if people who receive the vaccine get malaria after being bitten in a controlled setting (a controlled human malaria infection, CHMI). Objective: - To see if the PfSPZ malaria vaccine is safe and prevents malaria in a controlled setting. Eligibility: - Healthy adults 18 45 years old. Design: - Participants will be screened with medical history, physical exam, blood and lab tests, and EKG. - Participants will be split into 8 groups, to be in the study for 3 12 months. - Participants will receive 3 5 vaccinations, injected by a needle in an arm vein or muscle. - Participants will keep a health diary and be contacted by phone. - For CHMI, a cup with mosquitoes carrying malaria is applied to participants arm for 5 minutes. Five mosquitoes at a time are used, until 5 have bitten. Some groups will be exposed to malaria more than once. - After CHMI, participants will visit the clinic very frequently (including daily visits for 12 days) for 28 days. - Blood will be drawn at most visits, from 1 to 20 tubes. Physical exam and medical history may also be repeated - Participants who develop malaria will be treated immediately at the clinic. Standard treatment takes 72 hours. Malaria symptoms may last up to 3 days.
The primary objective is to evaluate the safety of 3 doses given at D0, W4, and W26 of 50 µg dosage of AMA1-DiCo adjuvanted either with GLA-SE or Alhydrogel® in healthy European adults not previously exposed to the parasite P.falciparum and in healthy African adults exposed to the parasite. The safety and the tolerability of the vaccine will be assessed on the rate of solicited and unsolicited events/reactions. The safety profile will include local and systemic reactions/events as well as the biological safety, based on a clinically significant change of the baseline value of the main biological criteria.
We propose to evaluate the community-level impact of intermittent preventive treatment (IPT) for malaria in schoolchildren on clinical outcomes and malaria transmission, using a cluster-randomised design in Jinja, Uganda. Dihydroartemisinin-piperaquine (DP) will be administered to schoolchildren monthly for up to six rounds of treatment during one school year. Outcomes will be measured using surveys of communities, schoolchildren, and mosquito vectors. Our proposal also includes health service research to evaluate the potential feasibility of taking the programme to scale, which will guide future research and implementation of the intervention, and help shape policies in Uganda and elsewhere in Africa.
The purpose of this study is to assess the effectiveness of different malaria control strategies in the first year of life. The effectiveness of delivering an intermittent screening and treatment programme with dihydroartemisinin-piperaquine (DHP), linked to local immunization programmes, will be compared to the current practice of passive case detection of malaria. This study has two objectives: 1. To assess the effectiveness of intermittent screening and treatment with dihydroartemisinin-piperaquine (DHP) administered at 2, 3, 4 and 9 months of age compared with the current practice of passive detection and treatment for malaria in an area with high drug resistance levels to both P. falciparum and P. vivax. 2. To evaluate the safety, efficacy and population pharmacokinetics of DHP in children under 1 year of age.