Trial reportThe American journal of tropical medicine and hygiene2016
Safety, Immunogenicity, and Protective Efficacy of Intradermal Immunization with Aseptic, Purified, Cryopreserved Plasmodium falciparum Sporozoites in Volunteers Under Chloroquine Prophylaxis: A Randomized Controlled Trial.
Trial report in The American journal of tropical medicine and hygiene, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 43 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
43 citing papers in PubMed, 1 synthesis or guideline pooled it, 67 citations in OpenAlex.
- Reproducibility of malaria sporozoite challenge model in humans for evaluating efficacy of vaccines and drugs: a systematic review.BMC infectious diseases · 2021Pooled it
- Trial
- Safety and Differential Antibody and T-Cell Responses to theThe American journal of tropical medicine and hygiene · 2019Trial
- Activatory Receptor NKp30 Predicts NK Cell Activation During Controlled Human Malaria Infection.Frontiers in immunology · 2019Trial
- Advancing Global Health through Development and Clinical Trials Partnerships: A Randomized, Placebo-Controlled, Double-Blind Assessment of Safety, Tolerability, and Immunogenicity of PfSPZ Vaccine for Malaria in Healthy Equatoguinean Men.The American journal of tropical medicine and hygiene · 2018Trial
- Trial
- Intradermal immunization with Plasmodium berghei late-arresting genetically attenuated sporozoites induces PD-L1 expression on regulatory macrophages and dendritic cells.Scientific reports · 2025Article
- Complete attenuation of Plasmodium falciparum sporozoites by atovaquone-proguanil.EMBO molecular medicine · 2025Article
- Successful insertion and expression of a tetracycline transactivator in Anopheles stephensi associated with increased egg production and decreased hatching rate.Parasites & vectors · 2025Article
- Statistical design and analysis of controlled human malaria infection trials.Malaria journal · 2024Article
- Ultra-low volume intradermal administration of radiation-attenuated sporozoites with the glycolipid adjuvant 7DW8-5 completely protects mice against malaria.Scientific reports · 2024Article
- Controlled Human Malaria Infection Studies in Africa-Past, Present, and Future.Current topics in microbiology and immunology · 2024Review
- Malaria Vaccines: Progress to Date.BioDrugs : clinical immunotherapeutics, biopharmaceuticals and gene therapy · 2023Review
- Safety, Tolerability, and Parasite Clearance Kinetics in Controlled Human Malaria Infection after Direct Venous Inoculation of Plasmodium falciparum Sporozoites: A Model for Evaluating New Blood-Stage Antimalarial Drugs.The American journal of tropical medicine and hygiene · 2022Article
- Efficient infection of non-human primates with purified, cryopreserved Plasmodium knowlesi sporozoites.Malaria journal · 2022Article
- Five decades of clinical assessment of whole-sporozoite malaria vaccines.Frontiers in immunology · 2022Review
- Transient knockdown of Anopheles stephensi LRIM1 using RNAi increases Plasmodium falciparum sporozoite salivary gland infections.Malaria journal · 2021Article
- Review
- Immune responses to malaria pre-erythrocytic stages: Implications for vaccine development.Parasite immunology · 2021Review
- Plasmodium sporozoites induce regulatory macrophages.PLoS pathogens · 2020Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
19 authors.
Funding
Abstract
Immunization of volunteers under chloroquine prophylaxis by bites of Plasmodium falciparum sporozoite (PfSPZ)-infected mosquitoes induces > 90% protection against controlled human malaria infection (CHMI). We studied intradermal immunization with cryopreserved, infectious PfSPZ in volunteers taking chloroquine (PfSPZ chemoprophylaxis vaccine [CVac]). Vaccine groups 1 and 3 received 3× monthly immunizations with 7.5 × 10(4) PfSPZ. Control groups 2 and 4 received normal saline. Groups 1 and 2 underwent CHMI (#1) by mosquito bite 60 days after the third immunization. Groups 3 and 4 were boosted 168 days after the third immunization and underwent CHMI (#2) 137 days later. Vaccinees (11/20, 55%) and controls (6/10, 60%) had the same percentage of mild to moderate solicited adverse events. After CHMI #1, 8/10 vaccinees (group 1) and 5/5 controls (group 2) became parasitemic by microscopy; the two negatives were positive by quantitative real-time polymerase chain reaction (qPCR). After CHMI #2, all vaccinees in group 3 and controls in group 4 were parasitemic by qPCR. Vaccinees showed weak antibody and no detectable cellular immune responses. Intradermal immunization with up to 3 × 10(5) PfSPZ-CVac was safe, but induced only minimal immune responses and no sterile protection against Pf CHMI.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.