Evidence map›Paper›PMID 30871535›Full record

SynthesisMalaria journal2019

Persistence of chloroquine resistance alleles in malaria endemic countries: a systematic review of burden and risk factors.

Moses Ocan, Dickens Akena, Sam Nsobya, Moses R Kamya, Richard Senono, Alison Annet Kinengyere, Ekwaro A Obuku

Abstract readSystematic Review
In one paragraph

Synthesis in Malaria journal, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 44 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
44citing papers in PubMed, 4 pooled it
–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

44 citing papers in PubMed, 4 syntheses or guidelines pooled it.

  1. Pooled it
  2. Mapping Antimalarial Drug Resistance in Mozambique: A Systematic Review ofInternational journal of molecular sciences · 2024
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  12. Ellagic Acid fromMolecules (Basel, Switzerland) · 2025
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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

7 authors.

Moses OcanDepartment of Pharmacology & Therapeutics, Makerere University, P.O. Box 7072, Kampala, Uganda. ocanmoses@gmail.com.ORCID http://orcid.org/0000-0002-8852-820X
Dickens AkenaDepartment of Psychiatry, Makerere University, P.O. Box 7072, Kampala, Uganda.
Sam NsobyaDepartment of Medical Microbiology, Makerere University, P.O. Box 7072, Kampala, Uganda.
Moses R KamyaDepartment of Medicine, Makerere University, P.O. Box 7072, Kampala, Uganda.
Richard SenonoInfectious Disease Institute, Makerere University, P. O. Box 22418, Kampala, Uganda.
Alison Annet KinengyereAlbert Cook Library, Makerere University, P.O. Box 7072, Kampala, Uganda.
Ekwaro A ObukuClinical Epidemiology Unit, Department of Medicine, Makerere University, P.O. Box 7072, Kampala, Uganda.

Funding

NURTURE:Research Training and Mentoring Program for Career Development of Faculty at Makerere University College of Health SciencesD43TW010132 · FIC · MAKERERE UNIVERSITY COLLEGE OF HEALTH SCIENCES · PI SEWANKAMBO, NELSON K · 2015 to 2019
$4.3M
Training in malaria surveillance, epidemiology and implementation science research to strengthen malaria policy and control in UgandaD43TW010526 · FIC · MAKERERE UNIVERSITY COLLEGE OF HEALTH SCIENCES · PI MATTHEW G DORSEY, MOSES Robert KAMYA · 2017 to 2026
$2.3M
FIC NIH HHS D43 TW010132FIC NIH HHS D43 TW010526Malaria training D43TW010526Nurture Foundation for Reproductive Research (NZ) D43TW010132
6 · The paper itself

Abstract

backgroundChloroquine, a previous highly efficacious, easy to use and affordable anti-malarial agent was withdrawn from malaria endemic regions due to high levels of resistance. This review collated evidence from published-reviewed articles to establish prevalence of Pfcrt 76T and Pfmdr-1 86Y alleles in malaria affected countries following official discontinuation of chloroquine use.

methodsA review protocol was developed, registered in PROSPERO (#CRD42018083957) and published in a peer-reviewed journal. Article search was done in PubMed, Scopus, Lilacs/Vhl and Embase databases by two experienced librarians (AK, RS) for the period 1990-to-Febuary 2018. Mesh terms and Boolean operators (AND, OR) were used. Data extraction form was designed in Excel spread sheet 2007. Data extraction was done by three reviewers (NL, BB and MO), discrepancies were resolved by discussion. Random effects analysis was done in Open Meta Analyst software. Heterogeneity was established using I

resultsA total of 4721 citations were retrieved from article search (Pubmed = 361, Lilac/vhl = 28, Science Direct = 944, Scopus = 3388). Additional targeted search resulted in three (03) eligible articles. After removal of duplicates (n = 523) and screening, 38 articles were included in the final review. Average genotyping success rate was 63.6% (18,343/28,820) for Pfcrt K76T and 93.5% (16,232/17,365) for Pfmdr-1 86Y mutations. Prevalence of Pfcrt 76T was as follows; East Africa 48.9% (2528/5242), Southern Africa 18.6% (373/2163), West Africa 58.3% (3321/6608), Asia 80.2% (1951/2436). Prevalence of Pfmdr-1 86Y was; East Africa 32.4% (1447/5722), Southern Africa 36.1% (544/1640), West Africa 52.2% (1986/4200), Asia 46.4% (1276/2217). Over half, 52.6% (20/38) of included studies reported continued unofficial chloroquine use following policy change. Studies done in Madagascar and Kenya reported re-emergence of chloroquine sensitive parasites (IC

conclusionThe prevalence of chloroquine resistance alleles among Plasmodium falciparum parasites have steadily declined since discontinuation of chloroquine use. However, Pfcrt K76T and Pfmdr-1 N86Y mutations still persist at moderate frequencies in most malaria affected countries.

Indexed as

Drug ResistanceAfricaAntimalarialsAsiaATP-Binding Cassette, Sub-Family C ProteinsChloroquineEndemic DiseasesGene FrequencyGenetic MarkersGenotypeMalaria, FalciparumMembrane Transport ProteinsPlasmodium falciparumPoint MutationPrevalenceProtozoan ProteinsAntimalarialsATP-Binding Cassette, Sub-Family C ProteinsChloroquineGenetic MarkersMdr1 protein, Plasmodium falciparumMembrane Transport ProteinsPfCRT protein, Plasmodium falciparumProtozoan ProteinsChloroquinePlasmodium falciparumPolicyRe-emergenceSensitivity

Identifiers

PMID30871535
PMCPMC6419488

What OpenQuestion holds

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Registered trials

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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.