Active clinical trials for "Malaria"

Despite having developed robust acquired immunity against complications of malaria, women can return to a susceptible state during their first pregnancies and contribute significantly to the burden of severe malaria in highly endemic areas. Naturally acquired protection against placental malaria correlates with the presence of high concentration of immunoglobulin G molecules (IgGs) against VAR2CSA, a parasite protein of the var gene family that is essential for the binding of infected erythrocytes to CSA in the placenta. To induce high concentrations of specific IgGs, subjects will receive escalating doses of PAMVAC vaccine antigen adjuvanted with Alhydrogel, Glucopyranosyl Lipid Adjuvant-Stable Emulsion (GLA-SE) or Glucopyranosyl Lipid Adjuvant-Liposome-QS-21 Formulation (GLA-LSQ). Three injections with the same dosage and adjuvant will be done, each 28 days apart (Day 0, 28 and 56). Control subjects will receive physiological saline instead of the vaccine and dose escalation will be staggered to ensure safety during the trial.

The purpose of this study is to assess the safety and immunogenicity of novel routes of administration of the candidate malaria vaccines ChAd63 encoding ME-TRAP and MVA encoding ME-TRAP. 30-33 Healthy adult volunteers will be recruited in Oxford. All vaccinations will be administered intravenously or subcutaneously. Each volunteer will receive a single vaccination of ChAd63 ME-TRAP or MVA ME-TRAP at different doses depending on the group.

This is a study in which healthy adult volunteers will be given either an experimental Malaria vaccine or a saline control vaccine. Each volunteer will receive three vaccinations in total. Volunteers will be randomly allocated to one of two groups: Group 1 will receive a low dose of the Malaria vaccine on days 0, 28, and 56. Group 2 will receive a saline solution on days 0, 28, and 56.

This is an open-label, multi-centre Phase I/IIa dose escalation blood-stage malaria CHMI trial to assess the safety, immunogenicity and efficacy of the candidate malaria vaccine RH5.1/AS01. All volunteers recruited will be healthy, malaria naïve adults aged between 18 and 45 years. Volunteers will be recruited and vaccinated at the CCVTM, Oxford; Guys and St Thomas' NIHR CRF, London; and the NIHR WTCRF, Southampton for the Phase Ia part of the trial, and at the CCVTM, Oxford and Guys and St Thomas' NIHR CRF, London for the Phase IIa stage.

This is a randomized, double-blind, placebo-controlled trial to evaluate safety and tolerability of PfSPZ Vaccine administered as five doses of 9.0x10^5 PfSPZ or normal saline at 0, +2, +4, +6 and +28 days to healthy HIV negative adult volunteers and healthy HIV positive volunteers in Tanzania.

This is an open label, Phase 2 study with controlled human malaria infection (CHMI). Twenty three subjects will be enrolled into 2 groups (15 subjects in the Chloroquine-Azithromycin [CQ/AZ] Intervention Group, and 8 subjects in the Chloroquine [CQ] Group). The CQ/AZ Group will receive experimental intervention of 300 mg of CQ and 2 g of azithromycin (AZ). The CQ Group will receive 300 mg of CQ only. All subjects will participate in the CHMI and will be required to stay at a hotel for evaluation for a maximum of 14 nights starting 7 days after the challenge. A standard dose of atovaquone-proguanil (Malarone®) will be administered to all symptomatic parasitemic subjects under directly observed treatment.

Malaria prophylaxis is recommended for sickle cell disease patients. In Nigeria, daily proguanil or weekly pyrimethamine are the most commonly prescribed regimens, but the current policy is not effective due to poor compliance and drug resistance. Intermittent treatment with a long acting drug regimen administered under supervision at clinic visits may be more effective. The aim of this trial is to compare the tolerability and acceptability of supervised bimonthly treatment with either sulfadoxine-pyrimethamine plus amodiaquine (SP+AQ) or mefloquine plus artesunate (MQ+AS), with the daily proguanil. Two hundred and seventy patients with sickle cell disease attending the paediatric sickle cell disease clinic in Ilorin hospital who meet the eligibility criteria and have parental consent, will be randomized to one of three prophylactic regimens: daily proguanil, bimonthly sulfadoxine-pyrimethamine plus amodiaquine, or bimonthly mefloquine plus artesunate. Patients will be asked to return to clinic every two months and whenever they are sick. At enrollment, the study paediatrician will conduct a physical examination of the child, and collect a venous blood sample for a complete blood cell count and biochemical screen, determination of G6PD genotype, preparation of blood smears for malaria microscopy and a blood spot for determination of molecular markers of resistance. Four days after each clinic visit, patients will be interviewed (by phone and, for a subset, at home or in the clinic) to ask about compliance and adverse events. Participants will be followed for one year. The parents or carer will be encouraged to bring their child to the Outpatient Department clinic if the child becomes unwell. The primary outcome of the trial is tolerability, secondary outcomes are adherence to the regimen, and incidence of malaria and the number of hospitalizations over 12 months. If the bimonthly regimens are well tolerated and the preliminary data from this study are promising, a larger multicentre trial will be required to determine efficacy.

The purpose of this study is to show the consistency of different lots of a candidate vaccine (257049) against malaria developed by GlaxoSmithKline (GSK) Biologicals.

Hypothesis: The MSP3-LSP/Alum vaccine, administered to children will have a protective efficacy of at least 30% (lower bound of confidence interval of 0) against malaria disease occurring during a period beginning from 14 days after the 3rd immunization until 1 year after. The primary objective of this double-blind, randomized, controlled trial will be to assess the clinical efficacy of MSP3-LSP/AlOH vaccine when administered by subcutaneous route in children aged 12-48 months against all clinical malaria episodes occurring during a period beginning from 14 days after the 3rd immunization until 3 months after 3rd immunization, when administered according to the following schedule:- Primary administration: Three doses of administered 4 weeks apart Secondary administration (Boost): One dose 3 months after the third dose in year 1 of the trial; and two doses, given exactly one year after the date corresponding to the third dose and the first boost given during Year 1 Case definition for an episode of malaria is a febrile illness with axillary temperature of ≥ 37.5ºC with P. falciparum parasitemia ≥ 5000 per μL

The study is designed to establish the best dose to safely infect healthy individuals with Plasmodium falciparum sporozoites (PfSPZ) via intravenous (IV) injection.