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Age De-escalation Safety Trial of PfSPZ-LARC2 Vaccine in Burkina Faso
Sponsor: Sanaria Inc.
Summary
This is a first-in-humans randomized, double-blind, placebo-controlled, age de-escalation Phase 1 trial of Plasmodium falciparum (Pf) late liver stage-arresting replication-competent (LARC) sporozoite (SPZ) malaria vaccine (Sanaria® PfSPZ-LARC2 Vaccine) administered to healthy, malaria-exposed adults and children by direct venous inoculation (DVI) to determine safety, tolerability, and immunogenicity. The PfSPZ comprising PfSPZ-LARC2 Vaccine contain a double gene deletion, of the Mei2 and LINUP genes. As a result, they undergo developmental arrest in the late liver stages without releasing merozoites into the blood stream (no blood stage parasites are produced, either asexual or sexual). Because Pf parasites with the LARC phenotype replicate in the liver before disintegrating, they amplify and diversify parasite protein expression and are expected to be a potent immunogen to induce anti-malarial immunity, equaling or exceeding the potency and efficacy of the replication-competent chemo-attenuated Sanaria® PfSPZ-CVac (chloroquine). Because the parasites are intrinsically attenuated, they are also expected to be safe and well tolerated, similar to radiation-attenuated Sanaria® PfSPZ Vaccine and to the single-gene(Mei2)-deleted GA2 parasites (also LARC phenotype) tested at the Leiden University Medical Center (LUMC), which, like PfSPZ-LARC2 Vaccine, disintegrate after replicating in the liver. PfSPZ-LARC2 Vaccine thus avoids the safety concerns associated with PfSPZ-CVac, which uses fully infectious, non-attenuated parasites to achieve replication and depends on co-administered chloroquine for attenuation. In summary, the genetically attenuated PfSPZ-LARC2 Vaccine should combine the best-in-class immunogenic potency and protective efficacy of PfSPZ-CVac (chloroquine) with the excellent safety and tolerability of intrinsically attenuated PfSPZ Vaccine and GA2 vaccine. This trial is designed to test the hypotheses that: 1. The vaccine is safe and well tolerated in each age group. 2. The true rate of breakthrough blood stage infection (or other concerning adverse events) is less than about 5%, with an 95% confidence level (this will be the level of confidence that there are no breakthroughs if no breakthroughs occur in the 50 participants receiving PfSPZ-LARC2 Vaccine).
Official title: Age De-escalation Clinical Trial to Evaluate the Safety, Tolerability and Immunogenicity of a Late Liver Stage-arresting, Replication-competent Plasmodium Falciparum Sporozoite Vaccine (Sanaria® PfSPZ-LARC2 Vaccine) Administered by Direct Venous Inoculation to Malaria-exposed Adults and Children in Burkina Faso
Key Details
Gender
All
Age Range
1 Year - 50 Years
Study Type
INTERVENTIONAL
Enrollment
75
Start Date
2025-03-04
Completion Date
2026-03
Last Updated
2026-03-20
Healthy Volunteers
Yes
Conditions
Interventions
PfSPZ-LARC2 Vaccine
The PfSPZ comprising PfSPZ-LARC2 Vaccine contain a double genetic deletion, of the Mei2 and LINUP genes, and undergo developmental arrest in the late liver stages without releasing merozoites into the blood stream (no blood stage parasites are produced)
Normal Saline (Placebo)
Normal Saline Placebo
Locations (1)
Groupe de Recherche Action en Santé (GRAS) / Unité de Recherche Clinique de Sabou
Ouagadougou, Burkina Faso