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Malaria,FalciparumPhase 1/2NCT05790889

A Study to Test Experimental Blood Stage Malaria Vaccine in Burkina Faso.

A Phase 1/2 study testing Rabies vaccine, RH5.1 10μg adjuvated with 50μg Matrix-M and RH5.2 5μg adjuvated with 50μg Matrix-M in people with Malaria,Falciparum, run by University of Oxford at 1 site in Burkina Faso.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

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 Read more about this study

Who is it for?
Ages 5 to 17 monthsHealthy volunteers can take part
Conditions the study is for
Malaria,Falciparum
What is being tested?
Rabies vaccine, RH5.1 10μg adjuvated with 50μg Matrix-M and RH5.2 5μg adjuvated with 50μg Matrix-M
Type of treatment
Vaccines
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
390 participants
Where
1 siteBurkina Faso
Study dates
3 Apr 2023to 16 Oct 2026
Phase
Phase 1/2
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 5 to 17 months
  • All sexes
  • Healthy volunteers accepted
  • Child

Who may be able to join

  • Healthy infant aged 5-17 months at the time of first study vaccination
  • Parent/guardian provides signed/thumb-printed informed consent
  • Infant and parent/guardian resident in the study area villages and anticipated to be available for vaccination and follow-up for 12 months following last dose of vaccination.

Who cannot join

  • Clinically significant congenital abnormalities as judged by the PI or other delegated individual.
  • Clinically significant skin disorder (psoriasis, contact dermatitis etc.), cardiovascular disease, respiratory disease, endocrine disorder, liver disease, renal disease, gastrointestinal disease, neurological illness as judged by the PI or other delegated individual.
  • Weight-for-age Z score of less than -3 or other clinical signs of malnutrition.
  • History of allergic reaction, significant IgE-mediated event, or anaphylaxis to immunization.
  • History of allergic disease or reactions likely to be exacerbated by any component of the vaccines.
  • Sickle cell disease.
Show all 14Show fewer
  • Clinically significant laboratory abnormality as judged by the study clinician.
  • Administration of immunoglobulins and/or any blood products within the three months preceding the planned administration of the vaccine candidate.
  • Receipt of any vaccine in the 7 days preceding enrolment, or planned receipt of any other vaccine within 7 days following each study vaccination.
  • History of vaccination with another malaria vaccine.
  • Participation in another research study involving receipt of an investigational product in the 30 days preceding enrolment, or planned use during the study period.
  • Known maternal HIV infection (no testing will be done by the study team).
  • Any confirmed or suspected immunosuppressive or immunodeficient state, including HIV infection; asplenia; recurrent, severe infections and chronic (more than 14 days) immunosuppressant medication within the past 6 months (for corticosteroids, this will mean prednisone, or equivalent, ≥0.5 mg/kg/day; inhaled and topical steroids are allowed).
  • Any significant disease, disorder or situation which, in the opinion of the Investigator, may either put the participants at risk because of participation in the trial, or may influence the result of the trial, or the participant's ability to participate in the trial.

Trial locations and contacts

1 site in 1 country.

Burkina Faso1 site
  • Institut de Recherche en Sciences de la Santé

    Siglé, Boulkiemdé Province, BP 7192 OUAGADOUGOU 03, BF

Other trials in Burkina Faso

About this study

Official title: 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 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

Read the detailed description

During the initial recruitment to Groups 1 and 2, participants will be randomised 1:2 to receive vaccination with the rabies control vaccination or RH5.1/Matrix-M.

During recruitment to Groups 3, 4 and 5, participants will be randomised 1:2:2 to receive vaccination with rabies control vaccination, RH5.1/Matrix-M or RH5.2-VLP/Matrix-M Efficacy of vaccination will be assessed by comparing the incidence of malaria cases in the pooled control groups (Groups 1 and 3) to the incidence of malaria in each investigational vaccine group (Groups 2,4 and 5).

There are three study vaccines: the IMP, 10μg RH5.1 adjuvanted with Matrix-M; 5μg RH5.2-VLP and Rabies Vaccine. Participants will receive the first vaccination of RH5.1 10μg with 50μg Matrix-M (Groups 2 and 4) or RH5.2 5μg with 50μg Matrix-M (Group 5). After approximately 4 weeks, a second dose will be administered, followed by a third and final vaccination approximately 4 weeks later (Groups 3-5) or approximately 4 months later (Groups 1-2). Second and third vaccinations will be administered at the same dose of both vaccine and adjuvant as at the initial vaccination and will be given within the window period of 5 months. Volunteers will be followed for 12 months from final vaccination.

The trial is funded by EDCTP grant number RIA2016V-1649-MMVC and by a Wellcome Trust Translational Award (205981/Z/17/Z)

Being tested
Rabies vaccine, RH5.1 10μg adjuvated with 50μg Matrix-M, RH5.2 5μg adjuvated with 50μg Matrix-M
Medical subject headings
Malaria, Falciparum

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Rabies vaccineBiological

    Vaccine

  • RH5.1 10μg adjuvated with 50μg Matrix-MBiological

    Vaccine

  • RH5.2 5μg adjuvated with 50μg Matrix-MBiological

    Vaccine

Study groups in NCT05790889
Study groupRoleWhat they receive
Group 1 (Control group)Placebo comparatorn= 60. Age= 5-17 months Rabies Vaccine administered on Days 0, 28 and 152.
Receives: Biological: Rabies vaccine
Group 2Experimentaln=120 Age= 5-17 months First vaccination of RH5.1 10μg with 50μg Matrix-M will be administered on day 0, followed by a second dose administered on Day 28, followed by a third and final dose at Day 152.
Receives: Biological: RH5.1 10μg adjuvated with 50μg Matrix-M
Group 3 (Control Group)Placebo comparatorn= 60. Age= 5-17 months Rabies Vaccine administered on Days 0, 28 and 56.
Receives: Biological: Rabies vaccine
Group 4Experimentaln=120 Age= 5-17 months First vaccination of RH5.1 10μg with 50μg Matrix-M will be administered on day 0, followed by a second dose administered on Day 28, followed by a third and final dose at Day 56.
Receives: Biological: RH5.1 10μg adjuvated with 50μg Matrix-M
Group 5Experimentaln=120 Age= 5-17 months First vaccination of RH5.2-VLP 5μg with 50μg Matrix-M will be administered on day 0, followed by a second dose administered on Day 28, followed by a third and final dose at Day 56.
Receives: Biological: RH5.2 5μg adjuvated with 50μg Matrix-M

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. To assess the protective efficacy against clinical malaria of RH5.1 in Matrix-MTM and RH5.2-VLP in Matrix-MTM in 5-17 months old children living in a malaria-endemic area for 6 months after the last vaccination.

    Time to first episode of clinical malaria (defined as the presence of axillary temperature higher than 37.5 degree celsius and P. Falciparum parasite density >5000 asexual forms/µL)

    Measured: From 14 days after the third study vaccination until 6 months after the third study vaccination.

  2. To assess the safety and reactogenicity of RH5.1 in Matrix-MTM and RH5.2-VLP in Matrix-MTM in 5-17 months old children living in a malaria-endemic area.

    Occurrence of solicited systemic reactogenicity signs and symptoms via clinic and home visits

    Measured: The month following each vaccination and at 6 and 12 months after administration of the final dose of vaccine.

Secondary outcomes (8)
  1. To assess the humoral immunogenicity of RH5.1 in Matrix-MTM and RH5.2-VLP in Matrix-MTM in 5-17 months old children living in a malaria-endemic area.

    The following measures will be assessed

    • Serum ELISA response:
    1. Quantitative antigen-specific IgG antibody levels (µg/mL readout) over time - analysis of peak responses and longevity; 2. Antigen-specific antibody subclass/isotype measurement; 3. Antigen-specific antibody avidity measurement; In vitro GIA against 3D7 clone P. falciparum parasites using purified total IgG and a single-cycle pLDH readout assay
    • Purified IgG ELISA versus GIA titration "Quality Analysis"

    Measured: Immunology blood samples will be collected at screening, day of vaccination (V) 1, 14 & 28 days post V2, day of V3, 14 days post V3, 2, 6 and 12 months post V3.

  2. To assess the protective efficacy against clinical malaria of RH5.1 in Matrix-MTM and RH5.2-VLP in Matrix-MTM in 5-17 months old children living in a malaria-endemic area for 3 months after the last vaccination.

    Time to first episode of clinical malaria (defined as the presence of axillary temperature ≥37.5°C and P. falciparum parasite density >5000 asexual forms/µL).

    Measured: From 14 days after the third study vaccination until 3 months after the third study vaccination

  3. To assess the protective efficacy against clinical malaria of RH5.1 in Matrix-MTM and RH5.2-VLP in Matrix-MTM in 5-17 months old children living in a malaria-endemic area

    Occurrence of solicited local reactogenicity signs and symptoms via clinic and home visits

    Measured: For 12 months after the last vaccination

  4. To assess the protective efficacy against asymptomatic P. falciparum infection of RH5.1 in Matrix-MTM and RH5.2-VLP in Matrix-MTM in 5-17 months old children living in a malaria-endemic area, by qPCR.

    Efficacy tested by conducting qPCR analysis

    Measured: At 6 and 12 months after administration of the final dose of vaccine.

  5. To assess the protective efficacy against asymptomatic P. falciparum infection against gametocytaemia of RH5.1 in Matrix-MTM and RH5.2-VLP in Matrix-MTM in 5-17 months old children living in a malaria-endemic area, by qPCR.

    The proportion of participants in each study arm that show presence of parasite density >5000 asexual forms/µL as measured by quantitative reverse-transcriptase PCR PLUS presence of axillary temperature <37.5°C and absence of history of fever within the last 24 hours. The proportion of participants in each study arm that show presence of parasite density >0 asexual forms/µL as measured by quantitative reverse-transcriptase PCR PLUS presence of axillary temperature <37.5°C and absence of history of fever within the last 24 hours.

    Measured: At 6 and 12 months post third study vaccination.

  6. To assess the protective efficacy against clinical malaria of RH5.1 in Matrix-M and RH5.2-VLP in Matrix-M in 5-17 months old children living in a malaria-endemic area for 12 months after the last vaccination.

    Time to first episode of clinical malaria (defined as the presence of axillary temperature ≥37.5°C and P. falciparum parasite density >5000 asexual forms/µL).

    Measured: From 14 days after the third study vaccination until 12 months after the third study vaccination

  7. To assess the protective efficacy against gametocytaemia of RH5.1 in Matrix-M and RH5.2-VLP in Matrix-M in 5-17 months old children living in a malaria-endemic area, by qPCR at 2 and 6 months after administration of the final dose of vaccine

    The proportion of participants in each study arm that show presence of gametocytes >0 gametocytes/μL as measured by quantitative reverse-transcriptase PCR.

    Measured: At 2 and 6 months post third study vaccination.

  8. Efficacy against incident severe anaemia and blood transfusion requirement

    The proportion of participants in each study arm with documented Hb <5.0 g/dL identified at clinical presentation in association with P. falciparum asexual parasitaemia > 5000 parasites/µL. The proportion of participants in each study arm with documented Hb <5.0 g/dL identified at clinical presentation and requirement for a blood transfusion.

    Measured: From 14 days after the third study vaccination until 6 months after the third study vaccination.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted30 Mar 2023
  2. Study start3 Apr 2023
  3. Primary completion16 Oct 2026
  4. Study completion16 Oct 2026

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1/2
Primary purpose
Prevention
Allocation
Randomised
Intervention model
Parallel groups
Masking
Double blind
Who is masked
Participant, Investigator
Enrolment
390 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05790889
Sponsor's protocol ID
VAC091
Status last verified
Oct 2026
First submitted
16 Jan 2023
Last updated
21 Oct 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No

Publications

  • Natama HM, Salkeld J, Some A, Soremekun S, Diallo S, Traore O, Rouamba T, Ouedraogo F, Ouedraogo E, Dabone KCS, Kone NA, Compaore ZMJ, Kafando M, Bonko MDA, Konate F, Sorgho H, Nielsen CM, Pipini D, Diouf A, King LDW, Shaligram U, Long CA, Cho JS, Lawrie AM, Skinner K, Roberts R, Miura K, Bradley J, Silk SE, Draper SJ, Tinto H, Minassian AM. Safety and efficacy of the blood-stage malaria vaccine RH5.1/Matrix-M in Burkina Faso: interim results of a double-blind, randomised, controlled, phase 2b trial in children. Lancet Infect Dis. 2025 May;25(5):495-506. doi: 10.1016/S1473-3099(24)00752-7. Epub 2024 Dec 10.

    PubMed 39672183

Questions about this trial

What is this clinical trial studying?

A Phase 1/2 study testing Rabies vaccine, RH5.1 10μg adjuvated with 50μg Matrix-M and RH5.2 5μg adjuvated with 50μg Matrix-M in people with Malaria,Falciparum, run by University of Oxford at 1 site in Burkina Faso.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 3 inclusion and 14 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 21 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Burkina Faso. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

To assess the protective efficacy against clinical malaria of RH5.1 in Matrix-MTM and RH5.2-VLP in Matrix-MTM in 5-17 months old children living in a malaria-endemic area for 6 months after the last vaccination. (time frame: From 14 days after the third study vaccination until 6 months after the third study vaccination.). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05790889, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Oct 2026.

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