Evidence map›Paper›PMID 25982190›Full record

ArticleMalaria journal2015

Field deployment of loop-mediated isothermal amplification for centralized mass-screening of asymptomatic malaria in Zanzibar: a pre-elimination setting.

Ulrika Morris, Mwinyi Khamis, Berit Aydin-Schmidt, Ali K Abass, Mwinyi I Msellem, Majda H Nassor, Iveth J González, Andreas Mårtensson, Abdullah S Ali, Anders Björkman and 1 more

Open access · goldAbstract read
In one paragraph

Article in Malaria journal, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 34 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
34citing papers in PubMed, 1 pooled it
8.3field-weighted citation impact, top 2% 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

34 citing papers in PubMed, 1 synthesis or guideline pooled it, 50 citations in OpenAlex.

  1. Pooled it
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  15. Detection ofThe American journal of tropical medicine and hygiene · 2019
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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

11 authors at 4 institutions in 4 countries.

Ulrika MorrisMalaria Research, Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Nobelsväg 16, 171 77, Stockholm, Sweden. ulrika.morris@ki.se.
Mwinyi KhamisZanzibar Malaria Elimination Programme (ZAMEP), Ministry of Health, Zanzibar, Tanzania. mwikha@hotmail.com.
Berit Aydin-SchmidtMalaria Research, Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Nobelsväg 16, 171 77, Stockholm, Sweden. berit.schmidt@ki.se.
Ali K AbassZanzibar Malaria Elimination Programme (ZAMEP), Ministry of Health, Zanzibar, Tanzania.
Mwinyi I MsellemZanzibar Malaria Elimination Programme (ZAMEP), Ministry of Health, Zanzibar, Tanzania. mmwinyi@hotmail.com.
Majda H NassorZanzibar Malaria Elimination Programme (ZAMEP), Ministry of Health, Zanzibar, Tanzania. maida.nassor@gmail.com.
Iveth J GonzálezFoundation for Innovative New Diagnostics (FIND), Geneva, Switzerland. Iveth.Gonzalez@finddx.org.
Andreas MårtenssonMalaria Research, Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Nobelsväg 16, 171 77, Stockholm, Sweden. Andreas.Martensson@ki.se.
Abdullah S AliZanzibar Malaria Elimination Programme (ZAMEP), Ministry of Health, Zanzibar, Tanzania. busudi@gmail.com.
Anders BjörkmanMalaria Research, Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Nobelsväg 16, 171 77, Stockholm, Sweden. anders.bjorkman@karolinska.se.
Jackie CookMalaria Research, Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Nobelsväg 16, 171 77, Stockholm, Sweden. Jackie.Cook@lshtm.ac.uk.
Zanzibar University · TZKarolinska Institutet · SEFoundation for Innovative New Diagnostics · CHLondon School of Hygiene & Tropical Medicine · GB

Funding

Medical Research Council MR/K012126/1
6 · The paper itself

Abstract

backgroundMolecular tools for detection of low-density asymptomatic Plasmodium infections are needed in malaria elimination efforts. This study reports results from the hitherto largest implementation of loop-mediated isothermal amplification (LAMP) for centralized mass screening of asymptomatic malaria in Zanzibar.

methodsHealthy individuals present and willing to participate in randomly selected households in 60 villages throughout Zanzibar were screened for malaria by rapid diagnostic tests (RDT). In 50% of the study households, participants were asked to provide 60 μL of finger-prick blood for additional LAMP screening. LAMP was conducted in two centralized laboratories in Zanzibar, by trained technicians with limited or no previous experience of molecular methods. The LAMP assay was performed with Loopamp(TM) MALARIA Pan/Pf Detection Kit (Eiken Chemical Company, Japan). Samples positive for Plasmodium genus (Pan)-LAMP were re-tested using Plasmodium falciparum-specific LAMP kits.

resultsPaired RDT and LAMP samples were available from 3983 individuals. The prevalence of asymptomatic malaria was 0.5% (CI 95% 0.1-0.8) and 1.6% (CI 95% 1.1-2.2) by RDT and Pan-LAMP, respectively. LAMP detected 3.4 (CI 95% 2.2-5.2) times more Plasmodium positive samples than RDT. DNA contamination was experienced, but solved by repetitive decontamination of all equipment and reagents.

conclusionsLAMP is a simple and sensitive molecular tool, and has potential in active surveillance and mass-screening programmes for detection of low-density asymptomatic malaria in pre-elimination settings. However, in order to deploy LAMP more effectively in field settings, protocols may need to be adapted for processing larger numbers of samples. A higher throughput, affordable closed system would be ideal to avoid contamination.

Indexed as

Nucleic Acid Amplification TechniquesAdolescentAdultAgedAged, 80 and overAsymptomatic InfectionsChildChild, PreschoolDiagnostic Tests, RoutineFemaleHumansInfantInfant, NewbornMalaria, FalciparumMaleMass Screening

Identifiers

PMID25982190
PMCPMC4440539
OpenAlexW1535417777

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.