Evidence map›Paper›PMID 30157794›Full record

ArticleBMC infectious diseases2018

Seasonal variations in Plasmodium falciparum genetic diversity and multiplicity of infection in asymptomatic children living in southern Ghana.

Joshua Adjah, Bless Fiadzoe, Ruth Ayanful-Torgby, Linda E Amoah

Open access · goldAbstract read
In one paragraph

Article in BMC infectious diseases, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
38citing papers in PubMed, 1 pooled it
10.8field-weighted citation impact, top 1% 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

38 citing papers in PubMed, 1 synthesis or guideline pooled it, 81 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Article
  4. Genetic Diversity ofThe Canadian journal of infectious diseases & medical microbiology = Journal canadien des maladies infectieuses et de la microbiologie medicale · 2026
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  11. Frontiers in cellular and infection microbiology · 2024
    Article
  12. Sampling for malaria molecular surveillance.Trends in parasitology · 2023
    Review
  13. Drug Use Practices and Self-Treatment for Suspected Malaria in Ibadan, Nigeria.The American journal of tropical medicine and hygiene · 2023
    Article
  14. Article
  15. Article
  16. Article
  17. Journal of parasitology research · 2022
    Article
  18. Article
  19. Article
  20. 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 1 institution in 1 country.

Joshua AdjahDepartment of Immunology, Noguchi Memorial Institute for Medical Research, University of Ghana, Accra, Ghana.
Bless FiadzoeDepartment of Immunology, Noguchi Memorial Institute for Medical Research, University of Ghana, Accra, Ghana.
Ruth Ayanful-TorgbyDepartment of Immunology, Noguchi Memorial Institute for Medical Research, University of Ghana, Accra, Ghana.
Linda E AmoahDepartment of Immunology, Noguchi Memorial Institute for Medical Research, University of Ghana, Accra, Ghana. lamoah@noguchi.ug.edu.gh.ORCID http://orcid.org/0000-0002-1652-8489
University of Ghana · GH

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundGenetic diversity in Plasmodium falciparum (P. falciparum) parasites is a major hurdle to the control of malaria. This study monitored changes in the genetic diversity and the multiplicity of P. falciparum parasite infection in asymptomatic children living in southern Ghana at 3 month intervals between April 2015 and January 2016.

methodsFilter paper blood spots (DBS) were collected quarterly from children living in Obom, a community with perennial malaria transmission and Abura, a community with seasonal malaria transmission. Genomic DNA was extracted from the DBS and used in polymerase chain reaction (PCR)-based genotyping of the merozoite surface protein 1 (msp 1) and merozoite surface protein 2 (msp 2) genes.

resultsOut of a total of 787 samples that were collected from the two study sites, 59.2% (466/787) tested positive for P. falciparum. The msp 1 and msp 2 genes were successfully amplified from 73.8% (344/466) and 82.5% (385/466) of the P. falciparum positive samples respectively. The geometric mean MOI in Abura ranged between 1.17 (95% CI: 1.08-1.28) and 1.48 (95% CI: 1.36-1.60) and was significantly lower (p < 0.01, Dunn's multiple comparison test) than that determined in Obom, where the geometric mean MOI ranged between 1.82 (95% CI: 1.58-2.08) and 2.50 (95% CI: 2.33-2.678) over the study period. Whilst the msp 1 R033:MAD20:KI allelic family ratio was dynamic, the msp 2 3D7:FC27 allelic family ratio remained relatively stable across the changing seasons in both sites.

conclusionsThis study shows that seasonal variations in parasite diversity in these communities can be better estimated by msp 1 rather than msp 2 due to the constantly changing relative intra allelic frequencies observed in msp 1 and the fact that the dominance of any msp 2 allele was dependent on the transmission setting but not on the season as opposed to the dominance of any msp 1 allele, which was dependent on both the season and the transmission setting.

Indexed as

Genetic VariationSeasonsAllelesAntigens, ProtozoanAsymptomatic InfectionsBacterial Typing TechniquesChildFemaleGene FrequencyGhanaHumansMalaria, FalciparumMaleMerozoite Surface Protein 1Plasmodium falciparumProtozoan ProteinsAntigens, ProtozoanMerozoite Surface Protein 1Protozoan ProteinsAlleleAsymptomaticGenetic diversityMalariamsp 1msp 2Multiplicity of infection

Identifiers

PMID30157794
PMCPMC6114730
OpenAlexW2889337920

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.