Evidence map›Paper›PMID 25712968›Full record

ArticleThe Journal of infectious diseases2015

Asymptomatic Multiclonal Plasmodium falciparum Infections Carried Through the Dry Season Predict Protection Against Subsequent Clinical Malaria.

Klara Sondén, Safiatou Doumbo, Ulf Hammar, Manijeh Vafa Homann, Aissata Ongoiba, Boubacar Traoré, Matteo Bottai, Peter D Crompton, Anna Färnert

Abstract read
In one paragraph

Article in The Journal of infectious diseases, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
38citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

38 citing papers in PubMed, 1 synthesis or guideline pooled it.

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  13. High Prevalence of PolyclonalTropical medicine and infectious disease · 2023
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Klara SondénUnit of Infectious Diseases, Department of Medicine Solna.
Safiatou DoumboMali International Center of Excellence in Research, University of Sciences, Technique, and Technology of Bamako.
Ulf HammarUnit of Biostatistics, Department of Epidemiology, Institute for Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
Manijeh Vafa HomannUnit of Infectious Diseases, Department of Medicine Solna.
Aissata OngoibaUnit of Biostatistics, Department of Epidemiology, Institute for Environmental Medicine, Karolinska Institutet, Stockholm, Sweden Mali International Center of Excellence in Research, University of Sciences, Technique, and Technology of Bamako.
Boubacar TraoréMali International Center of Excellence in Research, University of Sciences, Technique, and Technology of Bamako.
Matteo BottaiUnit of Biostatistics, Department of Epidemiology, Institute for Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
Peter D CromptonLaboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland.
Anna FärnertUnit of Infectious Diseases, Department of Medicine Solna.

Funding

Mechanisms of naturally-acquired immunity to malaria and clinical trials of anti-malaria monoclonal antibodiesZIAAI001155 · NIAID · NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES · PI CROMPTON, PETER · 2011 to 2025
$30.9M
Intramural NIH HHS
6 · The paper itself

Abstract

backgroundImmunity to the antigenically diverse parasite Plasmodium falciparum is acquired gradually after repeated exposure. Studies in areas of high malaria transmission have shown that asymptomatic individuals infected with multiclonal infections are at reduced risk of febrile malaria during follow-up.

methodsWe assessed the relationship between the genetic diversity of clones in P. falciparum infections that persist through the dry season and the subsequent risk of febrile malaria in 225 individuals aged 2-25 years in Mali, where the 6-month malaria and dry seasons are sharply demarcated. Polymerase chain reaction-based genotyping of the highly polymorphic merozoite surface protein 2 gene was performed on blood samples collected at 5 cross-sectional surveys.

resultsIn an age-adjusted analysis, individuals with multiclonal P. falciparum infections before the rainy season were at reduced risk of febrile malaria, compared with individuals who were uninfected (hazard ratio [HR], 0.28; 95% confidence interval [CI], .11-.69). In contrast, there was no significant association between risk of malaria and having 1 clone at baseline (HR, 0.71; 95% CI, .36-1.40).

conclusionsThe results suggest that persistent multiclonal infections carried through the dry season contribute to protection against subsequent febrile malaria, possibly by maintaining protective immune responses that depend on ongoing parasite infection.

Indexed as

SeasonsAdolescentAdultAgingAntigens, ProtozoanChildChild, PreschoolCohort StudiesFemaleGenotypeHumansMalaria, FalciparumMalePlasmodium falciparumProtozoan ProteinsRainAntigens, Protozoanmerozoite surface protein 2, PlasmodiumProtozoan Proteinschildrengenotypingimmunitymalariamsp2P. falciparum

Identifiers

PMID25712968
PMCPMC4539894

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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.