One-Shot antibody shields kids from malaria in landmark trial
NCT ID NCT05400655
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tested a single injection of an antibody called L9LS in healthy Kenyan children aged 5 months to 10 years. The goal was to see if it safely protects against malaria infection caused by the Plasmodium falciparum parasite. The trial involved 912 children and was completed, focusing on safety and how well the antibody works in a high-transmission area.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 2
Tests whether the treatment actually works, and watches for side effects, in a larger group.
- Participants
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912 people
The number who actually took part.
- Started
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Sep 2022
- Finished
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Jun 2024
- Lead sponsor
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A government research agency
The lead sponsor is the US National Institutes of Health.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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5 months to 10 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria Healthy children aged 5 months to 10 years (Part 1) or 5-59 months (Part 2). Weight ≥5 kg and weight ≤30 kg (Part 1) or weight ≥5 kg and ≤22.5 kg (Part 2) or weight ≥5 kg and ≤20 kg (for 30 mg/kg group) or weight ≥5 kg and ≤15 kg (for 40 mg/kg group), to ensure a maximum volume of two 2-mL (Part 1b) Hemoglobin level ≥8 g/dL. Height and weight Z-scores \>-2. Living within Alego-Usonga sub-county. Able to participate for the duration of the trial. Parent and/or guardian of participant able to provide informed consent. Exclusion Criteria Individuals meeting any of the following criteria will be excluded from study participation: Taking long-term cotrimoxazole. Participation or planned participation in any other interventional trial with an investigational product prior to the last required protocol visit or receipt of an investigational product within the past 30 days. (Note: Past, current, or planned participation in observational studies is NOT exclusionary.) Received any doses of any malaria vaccine. Participation in part 1 of this study (for individuals being screened for enrollment into part 2) Age \< 12 months at the time the RTS,S/AS01 vaccine is anticipated to become available in the whole of Siaya County Current significant medical condition (neurologic, cardiac, pulmonary, hepatic, endocrine, rheumatologic, autoimmune, renal, oncologic, or hematological) or evidence of any serious underlying medical condition identified by medical history, physical examination, or laboratory examination. Known sickle cell disease. (Note: Known sickle cell trait is NOT exclusionary.) White blood cell, absolute neutrophil, or platelet count outside the local laboratory-defined limits of normal. Subjects may be included at the investigator's discretion for values that are not clinically significant (ie., do not require any repeat or follow-up). Alanine transaminase (ALT) or creatinine (Cr) level above the local laboratory-defined upper limit of normal. (Subjects may be included at the investigator's discretion for values that are not clinically significant.) Infected with HIV. History of a severe allergic reaction or anaphylaxis. Severe asthma (defined as asthma that is unstable or required emergency care, urgent care, hospitalization, or intubation during the past 2 years, or that has required the use of oral or parenteral corticosteroids at any time during the past 2 years). Pre-existing autoimmune or antibody-mediated diseases including but not limited to: systemic lupus erythematosus, rheumatoid arthritis, multiple sclerosis, Sjogren's syndrome, or autoimmune thrombocytopenia. Known immunodeficiency syndrome. Use of chronic (≥14 days) oral or IV corticosteroids (excluding topical or nasal) at immunosuppressive doses (i.e., prednisone \>10 mg/day) or immunosuppressive drugs within 30 days of day 0. Known asplenia or functional asplenia. Clinical signs of malnutrition. Receipt of immunoglobulins and/or blood products within the past 6 months. Any history of menses. Behavioral, cognitive, or psychiatric disease that in the opinion of the investigator affects the ability of the subject to understand and comply with the study protocol. Parental/guardian study comprehension examination score of \<80% correct or per investigator discretion. Receipt of a live vaccine or a killed vaccine within the past 2 weeks prior to study agent administration. Known allergies or contraindication to dihydroartemisinin-piperaquine. Use or known need at the time of pre-enrolment (DP administration) of concomitant prohibited medication, including: Antimicrobial agents of the following classes (systemic use only): Macrolides (e.g. erythromycin, clarithromycin, azithromycin, roxithromycin) Fluoroquinolones (e.g., levofloxacin, moxifloxacin, sparfloxacin) Pentamidine Antiarrhythmic agents (e.g. amiodarone, sotalol) Antihistamines (e.g. promethazine) Antifungals (systemic): ketoconazole, fluconazole, itraconazole Antiretrovirals: Saquinavir Diuretics (e.g. hydrochlorothiazide, furosemide) Antipsychotics (neuroleptics): haloperidol, thioridazine Antidepressants: imipramine, citalopram, escitalopram Antiemetics: domperidone, chlorpromazine, ondansetron Increased risk of salivary gland hypofunction (dryness of the mouth, swelling under the tongue and/or below the ear, halitosis) History of any other illness or condition which, in the investigator's judgment, may substantially increase the risk associated with the subject's participation in the protocol or compromise the scientific objectives, or other condition(s) that, in the opinion of the investigator, would jeopardize the safety or rights of a subject participating in the trial, interfere with the evaluation of the study objectives, or render the subject unable to comply with the protocol.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Kenya Medical Research Institute (KEMRI) Center for Global Health Research (CGHR)
Kisumu, Kenya
More trials for these conditions
Other studies related to the condition(s) this trial covers.
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