Evidence map›Paper›PMID 25419900›Full record

ArticlePloS one2014

Serologically defined variations in malaria endemicity in Pará state, Brazil.

Maristela G Cunha, Eliane S Silva, Nuno Sepúlveda, Sheyla P T Costa, Tiago C Saboia, João F Guerreiro, Marinete M Póvoa, Patrick H Corran, Eleanor Riley, Chris J Drakeley

Erratum issuedOpen access · goldAbstract read
In one paragraph

Article in PloS one, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 29 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
29citing papers in PubMed, 1 pooled it
4.5field-weighted citation impact, top 6% 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

29 citing papers in PubMed, 1 synthesis or guideline pooled it, 33 citations in OpenAlex.

  1. Pooled it
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

10 authors at 4 institutions in 3 countries.

Maristela G CunhaInstituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil; Department of Immunology and Infection, London School of Hygiene & Tropical Medicine, London, United Kingdom.
Eliane S SilvaInstituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil.
Nuno SepúlvedaDepartment of Immunology and Infection, London School of Hygiene & Tropical Medicine, London, United Kingdom; Center of Statistics and Applications, University of Lisbon, Lisbon, Portugal.
Sheyla P T CostaInstituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil.
Tiago C SaboiaInstituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil.
João F GuerreiroInstituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil.
Marinete M PóvoaInstituto Evandro Chagas, Ananindeua, Pará, Brazil.
Patrick H CorranDepartment of Immunology and Infection, London School of Hygiene & Tropical Medicine, London, United Kingdom.
Eleanor RileyDepartment of Immunology and Infection, London School of Hygiene & Tropical Medicine, London, United Kingdom.
Chris J DrakeleyDepartment of Immunology and Infection, London School of Hygiene & Tropical Medicine, London, United Kingdom.
Universidade Federal do Pará · BRLondon School of Hygiene & Tropical Medicine · GBInstituto Evandro Chagas · BRUniversity of Lisbon · PT

Funding

Wellcome TrustWellcome Trust 091924
6 · The paper itself

Abstract

backgroundMeasurement of malaria endemicity is typically based on vector or parasite measures. A complementary approach is the detection of parasite specific IgG antibodies. We determined the antibody levels and seroconversion rates to both P. vivax and P. falciparum merozoite antigens in individuals living in areas of varying P. vivax endemicity in Pará state, Brazilian Amazon region. METHODOLOGY/PRINCIPAL

findingsThe prevalence of antibodies to recombinant antigens from P. vivax and P. falciparum was determined in 1,330 individuals. Cross sectional surveys were conducted in the north of Brazil in Anajás, Belém, Goianésia do Pará, Jacareacanga, Itaituba, Trairão, all in the Pará state, and Sucuriju, a free-malaria site in the neighboring state Amapá. Seroprevalence to any P. vivax antigens (MSP1 or AMA-1) was 52.5%, whereas 24.7% of the individuals were seropositive to any P. falciparum antigens (MSP1 or AMA-1). For P. vivax antigens, the seroconversion rates (SCR) ranged from 0.005 (Sucuriju) to 0.201 (Goianésia do Pará), and are strongly correlated to the corresponding Annual Parasite Index (API). We detected two sites with distinct characteristics: Goianésia do Pará where seroprevalence curve does not change with age, and Sucuriju where seroprevalence curve is better described by a model with two SCRs compatible with a decrease in force of infection occurred 14 years ago (from 0.069 to 0.005). For P. falciparum antigens, current SCR estimates varied from 0.002 (Belém) to 0.018 (Goianésia do Pará). We also detected a putative decrease in disease transmission occurred ∼29 years ago in Anajás, Goianésia do Pará, Itaituba, Jacareacanga, and Trairão.

conclusionsWe observed heterogeneity of serological indices across study sites with different endemicity levels and temporal changes in the force of infection in some of the sites. Our study provides further evidence that serology can be used to measure and monitor transmission of both major species of malaria parasite.

Indexed as

Endemic DiseasesAdolescentAdultAgedAged, 80 and overAntibodies, ProtozoanBrazilChildChild, PreschoolCross-Sectional StudiesFemaleGeographyHumansImmunoglobulin GInfantInfant, NewbornAntibodies, ProtozoanImmunoglobulin GMerozoite Surface Protein 1

Identifiers

PMID25419900
PMCPMC4242530
OpenAlexW2143802673

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.