Evidence map›Paper›PMID 33434190›Full record

ArticlePLoS neglected tropical diseases2021

Evaluation of conventional and four real-time PCR methods for the detection of Leishmania on field-collected samples in Ethiopia.

Behailu Merdekios, Myrthe Pareyn, Dagimawie Tadesse, Nigatu Eligo, Mekibib Kassa, Bart K M Jacobs, Herwig Leirs, Jean-Pierre Van Geertruyden, Johan van Griensven, Guy Caljon and 1 more

Open access · goldAbstract read
In one paragraph

Article in PLoS neglected tropical diseases, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed, 2 pooled it
4.5field-weighted citation impact, top 5% 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

22 citing papers in PubMed, 2 syntheses or guidelines pooled it, 33 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Article
  4. Molecular Detection ofAdvanced biomedical research · 2026
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  7. Validation of a Real-Time PCR for the Diagnosis ofTropical medicine and infectious disease · 2025
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  18. First molecular detection ofThe journal of venomous animals and toxins including tropical diseases · 2023
    Article
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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 2 countries.

Behailu MerdekiosDepartment of Public Health, Arba Minch University, Arba Minch, Ethiopia.ORCID 0000-0002-8378-241X
Myrthe PareynEvolutionary Ecology Group, University of Antwerp, Antwerp, Belgium.ORCID 0000-0002-8918-3901
Dagimawie TadesseDepartment of Public Health, Arba Minch University, Arba Minch, Ethiopia.ORCID 0000-0002-3770-1957
Nigatu EligoDepartment of Medical Entomology, Arba Minch University, Arba Minch, Ethiopia.
Mekibib KassaLeishmaniasis Research and Treatment Centre, University of Gondar, Gondar, Ethiopia.ORCID 0000-0002-3612-5716
Bart K M JacobsDepartment of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium.ORCID 0000-0002-4677-0911
Herwig LeirsEvolutionary Ecology Group, University of Antwerp, Antwerp, Belgium.
Jean-Pierre Van GeertruydenGlobal Health Institute, University of Antwerp, Antwerp, Belgium.ORCID 0000-0001-5006-6364
Johan van GriensvenDepartment of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium.
Guy CaljonLaboratory of Microbiology, Parasitology and Hygiene, University of Antwerp, Antwerp, Belgium.ORCID 0000-0002-4870-3202
Lieselotte CnopsDepartment of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium.ORCID 0000-0003-0658-1291
University of Antwerp · BEArba Minch University · ETInstituut voor Tropische Geneeskunde · BEUniversity of Gondar · ET

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

In most low-resource settings, microscopy still is the standard method for diagnosis of cutaneous leishmaniasis, despite its limited sensitivity. In Ethiopia, the more sensitive molecular methods are not yet routinely used. This study compared five PCR methods with microscopy on two sample types collected from patients with a suspected lesion to advise on optimal diagnosis of Leishmania aethiopica. Between May and July 2018, skin scrapings (SS) and blood exudate from the lesion spotted on filter paper (dry blood spot, DBS) were collected for PCR from 111 patients of four zones in Southern Ethiopia. DNA and RNA were simultaneously extracted from both sample types. DNA was evaluated by a conventional PCR targeting ITS-1 and three probe-based real-time PCRs: one targeting the SSU 18S rRNA and two targeting the kDNA minicircle sequence (the 'Mary kDNA PCR' and a newly designed 'LC kDNA PCR' for improved L. aethiopica detection). RNAs were tested with a SYBR Green-based RT-PCR targeting spliced leader (SL) RNA. Giemsa-stained SS smears were examined by microscopy. Of the 111 SS, 100 were positive with at least two methods. Sensitivity of microscopy, ITS PCR, SSU PCR, Mary kDNA PCR, LC kDNA PCR and SL RNA PCR were respectively 52%, 22%, 64%, 99%, 100% and 94%. Microscopy-based parasite load correlated well with real-time PCR Ct-values. Despite suboptimal sample storage for RNA detection, the SL RNA PCR resulted in congruent results with low Ct-values. DBS collected from the same lesion showed lower PCR positivity rates compared to SS. The kDNA PCRs showed excellent performance for diagnosis of L. aethiopica on SS. Lower-cost SL RNA detection can be a complementary high-throughput tool. DBS can be used for PCR in case microscopy is negative, the SS sample can be sent to the referral health facility where kDNA PCR method is available.

Indexed as

AlgorithmsDNA, KinetoplastDNA, ProtozoanEthiopiaLeishmaniaLeishmaniasisLeishmaniasis, CutaneousParasite LoadReal-Time Polymerase Chain ReactionSensitivity and SpecificitySkinSpecimen HandlingSurveys and QuestionnairesDNA, KinetoplastDNA, Protozoan

Identifiers

PMID33434190
PMCPMC7802924
OpenAlexW3118608068

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.