Evidence map›Paper›PMID 21747921›Full record

ArticlePloS one2011

Serological evidence of discrete spatial clusters of Plasmodium falciparum parasites.

Philip Bejon, Louise Turner, Thomas Lavstsen, Gerald Cham, Ally Olotu, Chris J Drakeley, Marc Lievens, Johan Vekemans, Barbara Savarese, John Lusingu and 4 more

Abstract read
In one paragraph

Article in PloS one, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed
–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

26 citing papers in PubMed.

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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

14 authors.

Philip BejonCentre for Geographic Medicine Research, Kenya Medical Research Institute/Wellcome Trust Programme, Coast, Kilifi, Kenya. pbejon@well.ox.ac.uk
Louise Turner
Thomas Lavstsen
Gerald Cham
Ally Olotu
Chris J Drakeley
Marc Lievens
Johan Vekemans
Barbara Savarese
John Lusingu
Lorenz von Seidlein
Peter C Bull
Kevin Marsh
Thor G Theander

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundMalaria transmission may be considered to be homogenous with well-mixed parasite populations (as in the classic Ross/Macdonald models). Marked fine-scale heterogeneity of transmission has been observed in the field (i.e., over a few kilometres), but there are relatively few data on the degree of mixing. Since the Plasmodium falciparum Erythrocyte Membrane Protein 1 (PfEMP1) is highly polymorphic, the host's serological responses may be used to infer exposure to parasite sub-populations. METHODS AND

findingsWe measured the antibody responses to 46 individual PfEMP1 domains at four time points among 450 children in Kenya, and identified distinct spatial clusters of antibody responses to individual domains. 35 domains showed strongly significant sero-clusters at p = 0.001. Individuals within the high transmission hotspot showed the greatest diversity of anti-PfEMP1 responses. Individuals outside the hotspot had a less diverse range of responses, even if as individuals they were at relatively intense exposure.

conclusionsWe infer that antigenically distinct sub-populations of parasites exist on a fine spatial scale in a study area of rural Kenya. Further studies should examine antigenic variation over longer periods of time and in different study areas.

Indexed as

AgingAnimalsAntibody FormationCluster AnalysisHumansInfantMalariaPlasmodium falciparumPrincipal Component AnalysisProtozoan ProteinsSerologic TestsTime Factorserythrocyte membrane protein 1, Plasmodium falciparumProtozoan Proteins

Identifiers

PMID21747921
PMCPMC3126844

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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.