Trial reportBMC medicine2021
Safety, infectivity and immunogenicity of a genetically attenuated blood-stage malaria vaccine.
Trial report in BMC medicine, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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
8 citing papers in PubMed, 8 citations in OpenAlex.
- Development of an Experimental Human Blood-Stage Model for Studying Plasmodium knowlesi.The Journal of infectious diseases · 2026Article
- Genetic diversity of the Plasmodium falciparum Pfs230 gene in four East African countries supports its potential as a malaria transmission‑blocking vaccine candidate.Malaria journal · 2026Article
- Next-Generation Vaccines Against Neglected Diseases: New Promises from Genetically Modified Live-Attenuated Parasites and RNA Vaccines.Microorganisms · 2026Review
- Experimental vaccination by single dose sporozoite injection of blood-stage attenuated malaria parasites.EMBO molecular medicine · 2024Article
- Review
- Malaria Vaccines: Progress to Date.BioDrugs : clinical immunotherapeutics, biopharmaceuticals and gene therapy · 2023Review
- A genetically engineeredScience translational medicine · 2022Article
- Live Vaccination with Blood-StageVaccines · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
29 authors at 10 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThere is a clear need for novel approaches to malaria vaccine development. We aimed to develop a genetically attenuated blood-stage vaccine and test its safety, infectivity, and immunogenicity in healthy volunteers. Our approach was to target the gene encoding the knob-associated histidine-rich protein (KAHRP), which is responsible for the assembly of knob structures at the infected erythrocyte surface. Knobs are required for correct display of the polymorphic adhesion ligand P. falciparum erythrocyte membrane protein 1 (PfEMP1), a key virulence determinant encoded by a repertoire of var genes.
methodsThe gene encoding KAHRP was deleted from P. falciparum 3D7 and a master cell bank was produced in accordance with Good Manufacturing Practice. Eight malaria naïve males were intravenously inoculated (day 0) with 1800 (2 subjects), 1.8 × 10
resultsNone of the subjects who were administered with 1800 or 1.8 × 10
conclusionsThis study represents the first clinical investigation of a genetically attenuated blood-stage human malaria vaccine. A P. falciparum 3D7 kahrp- strain was tested in vivo and found to be immunogenic but can lead to patent parasitemia at high doses.
trial registrationAustralian New Zealand Clinical Trials Registry (number: ACTRN12617000824369 ; date: 06 June 2017).
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What OpenQuestion holds
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.