Evidence map›Paper›PMID 22339946›Full record

ArticleParasitology2012

Quantification of Plasmodium falciparum malaria from complex infections in the Peruvian Amazon using quantitative PCR of the merozoite surface protein 1, block 2 (PfMSP1-B2): in vitro dynamics reveal density-dependent interactions.

Thomas M Zervos, Jean N Hernandez, Patrick L Sutton, Oralee H Branch

Abstract readEvaluation Study
In one paragraph

Article in Parasitology, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–field-weighted citation impact, top 72% of its field
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

1 citing paper in PubMed, 2 citations in OpenAlex.

  1. Article
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

4 authors at 2 institutions in 2 countries.

Thomas M ZervosDepartment of Medical Parasitology, New York University School of Medicine, 341 E 25th St, OPH, New York, NY 10010, USA.
Jean N Hernandez
Patrick L Sutton
Oralee H Branch
New York University · USUniversidad Nacional de la Amazonía Peruana · PE

Funding

Malaria: Immunity and Diversity in Low TransmissionR01AI064831 · NIAID · UNIVERSITY OF ALABAMA AT BIRMINGHAM · PI BRANCH, ORALEE H · 2006 to 2010
$2.3M
P. falciparum Pathways and Pathology: RBC Invasion in the Peruvian Malaria CohortR03TW008064 · FIC · UNIVERSITY OF ALABAMA AT BIRMINGHAM · PI BRANCH, ORALEE H · 2008 to 2010
$107k
FIC NIH HHS R03 TW008064FIC NIH HHS R03-TW008064NIAID NIH HHS R01 AI064831
6 · The paper itself

Abstract

The majority of Plasmodium falciparum field isolates are defined as complex infections because they contain multiple genetically distinct clones. Studying interactions between clones in complex infections in vivo and in vitro could elucidate important phenomena in malaria infection, transmission and treatment. Using quantitative PCR (qPCR) of the P. falciparum merozoite surface protein 1, block 2 (PfMSP1-B2), we provide a sensitive and efficient genotyping method. This is important for epidemiological studies because it makes it possible to study genotype-specific growth dynamics. We compared 3 PfMSP1-B2 genotyping methods by analysing 79 field isolates from the Peruvian Amazon. In vivo observations from other studies using these techniques led to the hypothesis that clones within complex infections interact. By co-culturing clones with different PfMSP1-B2 genotypes, and measuring parasitaemia using qPCR, we found that suppression of clonal expansion was a factor of the collective density of all clones present in a culture. PfMSP1-B2 qPCR enabled us to find in vitro evidence for parasite-parasite interactions and could facilitate future investigations of growth trends in naturally occurring complex infections.

Indexed as

AnimalsDNA, ProtozoanGenotypeHumansMalaria, FalciparumMerozoite Surface Protein 1PeruPlasmodium falciparumPolymerase Chain ReactionProtozoan ProteinsSensitivity and SpecificityDNA, ProtozoanMerozoite Surface Protein 1Protozoan Proteins

Identifiers

PMID22339946
PMCPMC3773723
OpenAlexW2322699166

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

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.