Infant Malaria Vaccine Schedule Optimization
A Phase 2b Multicenter Randomized, Placebo-Controlled, Double-Blind, Study to Evaluate the Safety, Immunogenicity and Efficacy of R21/Matrix-M Malaria Vaccine in African Infants With Different Immunization Schedules
PATH
1,200 participants
May 30, 2025
INTERVENTIONAL
Conditions
Summary
The aim of this study is to identify an optimal infant vaccine schedule for a malaria vaccine which is better aligned with the timing of other vaccine interventions.
Eligibility
Inclusion Criteria6
- Signed informed consent or thumb-printed and witnessed informed consent obtained from the parent/legal guardian of the infant.
- Infants must have been born full-term (at ≥37 weeks of gestation) and \> 2500 grams at birth.
- Immunization schedule Cohorts 1, 2, and 3: : Male and female infants 42-49 days (inclusive) of age at time of enrollment. For infants in Cohort 1, randomization to receive vaccine dose 1 (Groups 1 and 2 of R21/MM or placebo, respectively) will occur at 42-49 days of age. For infants in Cohort 2, randomization to receive vaccine dose 1 (Groups 3 and 4 of R21/MM or placebo, respectively) will occur at 2 months (56-63 days of age). For infants in Cohort 3, randomization to receive vaccine dose 1 (Groups 5 and 6 of R21/MM or placebo, respectively) will occur at 3 months (84-91 days of age).
- The participant's parent/guardian must be willing to avoid travel, particularly in the 28 days after each study vaccination, must confirm willingness to contact the study team in the event of unexpected/unavoidable travel and, for the safety cohort, must confirm availability for the home visits to be conducted by a field worker to collect solicited AEs over the 7 days (day of vaccination and 6 subsequent days) following each study vaccine.
- The participant's parent/guardian must confirm willingness to bring their child to the study clinic / local health care clinic, and capacity to contact the study team in the event the subject has any illnesses or other health concerns during the study.
- Participants who the investigator believes that their parent/guardian can and will comply with the requirements of the protocol (e.g. return for follow-up visits) may be enrolled in the study.
Exclusion Criteria12
- Acute disease at the time of enrolment (acute disease is defined as the presence of a moderate or severe illness with or without fever. All vaccines can be administered to participants with a minor illness such as diarrhea, mild upper respiratory infection, without low-grade febrile illness, i.e. axillary temperature \< 37.5°C).
- Clinically significant pulmonary, cardiovascular, gastrointestinal, endocrine, neurological, skin, hepatic or renal functional abnormality, as determined by medical history, physical examination or laboratory tests 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.
- At time of enrollment, any infant who has received any dose of the hexavalent/pentavalent vaccines, pneumococcal vaccine, rotavirus vaccine, IPV or has received more than one dose of oral polio virus or more than one dose of hepatitis B vaccine.
- Weight-for-height/length Z score of less than -3 or other clinical signs of malnutrition.
- Infant with major congenital defects.
- The infant has anaemia associated with clinical signs of symptoms of decompensation, or a haemoglobin of ≤ 5.0 g/dL.
- History of allergic disease or reactions likely to be exacerbated by any component of the vaccines.
- Any confirmed or suspected immunosuppressive or immunodeficient state (including HIV or asplenia) or known maternal HIV infection (no HIV testing will be routinely done by the study team).
- Administration of immunoglobulins and/or any blood products/blood transfusion from birth to time of planned administration of the vaccine candidate.
- Previous vaccination of participant or biological mother with a malaria vaccine.
- Participation in another research study involving receipt of an investigational product or planned use during the study period.
- Any other findings that the investigator feels would increase the risk of having an adverse outcome from participation in the trial.
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Interventions
Administered by intramuscular injection. Each 0.5 mL dose contains R21 Malaria Antigen (5 mcg) and Matrix-M1 (Adjuvant) (50 mcg).
Administered by intramuscular injection. Each dose (0.5 mL) contains Normal saline (0.9%).
Administered by intramuscular injection. Each dose of 0.5 mL contains: * Diphtheria Toxoid \> 30 IU * Tetanus Toxoid \> 40 IU * B. pertussis (whole cell) \> 4 IU * Hepatitis B surface antigen (HBsAg) (recombinant DNA) 15 mcg * Inactivated polio vaccine (Salk strains grown on vero cells): Type - 1 (Mahoney strain) 40 D antigen units (DU); Type - 2 (MEF-1 strain) 8 DU; Type - 3 (Saukett strain) 32 DU * Haemophilus influenzae Type b (Hib) Conjugate Vaccine (Adsorbed) polyribosylribitol phosphate (PRP) 10 mcg conjugated to tetanus toxoid (TT) (carrier protein) 19 to 33 mcg\]
Administered by intramuscular injection. Each 0.5 mL dose contains 2 mcg each Saccharide for serotypes 1, 5, 9V, 14, 19A, 19F, 23F, 7F, 6A and 4 mcg Saccharide for serotype 6B.
Administered orally. Each 2.0 mL dose contains: Live Attenuated Bovine-Human Rotavirus Reassortant \[G1, G2, G3, G4 and G9\], 5.6 focus-forming units (FFU) / serotype.
Administered by subcutaneous injection. Each 0.5 mL dose contains not less than 1000 cell culture infectious dose 50% (CCID50) of Measles virus and 1000 CCID50 of Rubella virus.
Administered by intramuscular injection. Each 0.5 mL dose contains Meningococcal A polysaccharide 10 mcg and tetanus toxoid (TT) (carrier protein) 10 to 33 mcg.
Yellow fever vaccine will be locally sourced by each trial site in accordance with the countries' EPI program.
Typhoid conjugate vaccine will be locally sourced by each trial site in accordance with the countries' EPI program.
Locations(2)
View Full Details on ClinicalTrials.gov
For the most up-to-date information, visit the official listing.
NCT06879327