Active clinical trials for "Malaria, Falciparum"

Malaria remains one of the leading causes of morbidity and mortality worldwide. Plasmodium falciparum is a complex pathogen with numerous immune evasion mechanisms which has added layers of complexity to the development of safe and protective vaccines. There remains an urgent need to identify and develop more protective and more affordable vaccine candidates that could achieve the World Health Organization (WHO) goal of 75% efficacy against clinical malaria. R21 is a novel pre-erythrocytic candidate malaria vaccine. R21 includes Hepatitis B surface antigen (HBsAg) fused to the C-terminus and central repeats of the circumsporozoite protein of P. falciparum (CSP), which self-assemble into virus-like particles in yeast. R21 lacks the excess HBsAg found and comprises only fusion protein moieties. R21/MatrixM (MM) had a favourable safety profile and was well tolerated. The majority of adverse events were mild, with the most common event being fever. None of the serious adverse events were attributed to the vaccine. At one year, vaccine efficacy remained high, at 77%. Participants vaccinated with R21/MM showed high titres of malaria-specific anti- Asn-Ala-Asn-Pro (NANP) antibodies 28 days after the third vaccination, which were almost doubled with the higher adjuvant dose. Titres waned but were boosted to levels similar to peak titres after the primary series of vaccinations after a fourth dose administered one year later. Currently, there are no safety and immunogenicity data for the use of R21/MatrixM in Asian populations. This trial will generate the required data for the use of this vaccine in Asia. For integration with the current targeted malaria elimination (TME) activities, which provide mass drug administrations at months M0, M1, and M2, it would be most efficient and practical to provide the vaccine at the same intervals. In summary: The investigators propose to conduct a safety and immunogenicity trial of R21/MatrixM in Thai adults. The major aims of this study are to 1) assess the safety and immunogenicity of R21/MatrixM in Thai adults 2) confirm that the co-administration of antimalarial drugs with the malaria vaccine R21/MatrixM does not reduce the immunogenicity of the vaccine and 3) assess the absorption and pharmacokinetics of antimalarial drugs piperaquine, and a single low dose of primaquine (SLDPQ) when co-administered with R21/MatrixM. This is a randomized, open label, single centre, Phase 2 study. 120 healthy non-pregnant Thai adults, aged 18-55 years, inclusive, will be recruited. Each participant will be randomized into one of the following study arms in a ratio of 5:5:2, as follows: R21/MatrixM + Dihydroartimisinin (DHA)-Piperaquine (PIP)+ primaquine (PQ) (Group 1, n=50) will receive R21/MatrixM + 3 doses DHA-PIP+PQ at Month 0, Month 1 and Month 2 R21/MatrixM only (Group 2, n=50) will receive R21/MatrixM standard dose at Month 0, Month 1 and Month 2 DHA-PIP+PQ only (Group 3, n=20) will receive 3 doses DHA-PIP+PQ at Month 0, Month 1 and Month 2

This is a Phase Ib multi-stage Plasmodium falciparum malaria vaccine study to assess the safety and immunogenicity of the blood-stage vaccine candidate RH5.2 virus-like particle (VLP) in Matrix-MTM and the pre-erythrocytic stage vaccine candidate R21 in Matrix-MTM, both alone and in combination, in adults and infants in the Gambia

Malaria is a major public health problem in Africa. An important way to control the disease is by Indoor Residual Spraying of insecticide in houses. Insecticide resistance has become a major problem. This trial will evaluate a novel insecticide against those insecticide resistant mosquito vectors in Tanzania E Africa.

Malaria is a major public health problem. There were around 240 million cases of malaria and 627,000 deaths worldwide in 2020. There is a great need for a safe, effective malaria vaccine and the team at University of Oxford is trying to make vaccine(s) which can prevent serious illness and death. This study is being done to assess an experimental malaria vaccine for its ability to prevent malaria illness. This is done using a 'blood-stage challenge model'. This is when volunteers are infected with malaria parasites using malaria-infected red blood cells. The vaccine we are testing in this part of the study is called "RH5.2-VLP". It is given with an adjuvant called "Matrix-M". This is a substance to improve the body's response to a vaccination. RH5.2-VLP is being tested for the first time in humans in this trial. The Matrix-M adjuvant has been given to tens of thousands of people, with no major concerns, such as illness. The aim is to use this vaccine and adjuvant to help the body make an immune response against parts of the malaria parasite. This study will assess: The safety of the vaccine in healthy participants. The response of the human immune system to the vaccine. The ability of the vaccine to prevent malaria illness (Group 2 only). We will do this by giving healthy adult participants (aged 18-45) three of the vaccines and/or expose participants to malaria infection at the Centre for Clinical Vaccinology and Tropical Medicine (CCVTM), Churchill Hospital in Oxford. We will then do blood tests and collect information about any symptoms that occur after vaccination. There will be 19 to 54 visits, lasting between 3 months to 2 years and 2 months.

A Phase 1, open label clinical study to evaluate the safety, immunogenicity, tolerability and efficacy of Plasmodium falciparum Malaria Protein 013 (FMP013) combined with (ALF with QS-21), saponin molecule derived from the bark of Quillaja species (ALFQ)) in healthy adult volunteers at different doses and dosing schedules.

This is an open-label, single-centre Phase I P. falciparum blood-stage vaccine trial to assess the safety and immunogenicity and efficacy of the candidate malaria vaccines R78C and RH5.1 formulated in adjuvant Matrix-M

In this randomized, double-blind, placebo-controlled trial, 268 healthy Malian children aged 6-10 years, residing in Bancoumana and surrounding villages, will be administered three doses of 9.0x10^5 Pf sporozoites (PfSPZ) of PfSPZ Vaccine (or placebo) at 1, 8, and 29-days using direct venous inoculation (DVI). The study is composed of a single cohort with two arms (categorized by placebo control/experimental groups) designed to assess the safety, immunogenicity and protective efficacy of PfSPZ Vaccine. All subjects will receive artemether-lumefantrine (AL) approximately 1- 2 weeks before the first dose of PfSPZ Vaccine or normal saline for clearance of Pf parasitemia. Vaccinated participants and non-immunized controls will be followed for safety and monitored for development of parasitemia through the natural malaria transmission season to estimate vaccine efficacy (VE).

This is a Phase IIb randomised controlled trial of the safety, immunogenicity and efficacy of the blood-stage malaria vaccine candidates RH5.1 in Matrix-MTM and RH5.2-VLP in Matrix-MTM in infants aged 5-17 months in Burkina Faso

This study will assess the coadministration of genetically attenuated Plasmodium falciparum ∆mei2 (GA2) sporozoites with adjuvants (BCG and YF-17D vaccination and imiquimod cream). Primary outcomes will be safety, tolerability and protective efficacy against CHMI.

Seasonal Malaria Chemoprophylaxis (SMC) is a fundamental component of malaria control. The SMC program involves that sulfadoxine-pyrimethamine plus amodiaquine (SPAQ) is given to children below the age of 5 years during the peak transmission season in areas of seasonal malaria transmission. Yet, its efficacy is increasingly below expectations. This study involves an Operational evaluation of a modified existing intervention and its implementation are prepared in direct interaction with the Ministry of Health (MoH) to tailor data collection to local needs. The main questions it aims to answer are: what are the reasons for the continued high infection rates in the SMC-targeted population; what are the implications for transmission of sub-optimal SMC in children less than 5 years old; can the impact of SMC be improved by including older age groups that would both expand the population that experiences direct chemoprophylactic benefits and concurrently reduce transmission to the wider community Researchers will: i) Compare SMC effectiveness as implemented by the national malaria control program and SMC implemented in a research context where all doses are directly observed. ii) Quantify the infectious reservoir and the contribution of different age groups to transmission with conventional SMC (<5 years) and extended SMC (<10 years) iii) Determine the impact of drug resistance and drug absorption on SMC efficacy iv) Understand social barriers and enablers interfering with SMC efficacy and how SMC uptake is related to health equity with special attention to gender inequalities. v) Quantify SMC efficacy decay under programmatic conditions and key drivers of this decay.