Evidence map›Paper›PMID 31136585›Full record

ArticlePLoS neglected tropical diseases2019

Persistent transmission of Plasmodium malariae and Plasmodium ovale species in an area of declining Plasmodium falciparum transmission in eastern Tanzania.

Victor Yman, Grace Wandell, Doreen D Mutemi, Aurelie Miglar, Muhammad Asghar, Ulf Hammar, Mattias Karlsson, Ingrid Lind, Cleis Nordfjell, Ingegerd Rooth and 3 more

Abstract read
In one paragraph

Article in PLoS neglected tropical diseases, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 92 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
92citing papers in PubMed, 1 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

92 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Trial
  3. Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Observational
  10. Article
  11. Article
  12. Article
  13. Review
  14. Article
  15. Article
  16. Article
  17. Article
  18. Longitudinal analysis of the prevalence of minormedRxiv : the preprint server for health sciences · 2025
    Article
  19. Article
  20. Ex Vivo Drug Susceptibility ofPathogens (Basel, Switzerland) · 2025
    Article

32 more citing papers are in PubMed but not listed here.

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

13 authors.

Victor YmanDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.ORCID 0000-0001-7267-0749
Grace WandellDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.ORCID 0000-0002-9799-742X
Doreen D MutemiDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
Aurelie MiglarDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
Muhammad AsgharDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
Ulf HammarUnit of Biostatistics, Department of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
Mattias KarlssonDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
Ingrid LindDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
Cleis NordfjellDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
Ingegerd RoothDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
Billy NgasalaDepartment of Parasitology and Medical Entomology, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania.
Manijeh Vafa HomannDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.ORCID 0000-0002-3212-3289
Anna FärnertDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.ORCID 0000-0001-7583-282X

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

A reduction in the global burden of malaria over the past two decades has encouraged efforts for regional malaria elimination. Despite the need to target all Plasmodium species, current focus is mainly directed towards Plasmodium falciparum, and to a lesser extent P. vivax. There is a substantial lack of data on both global and local transmission patterns of the neglected malaria parasites P. malariae and P. ovale spp. We used a species-specific real-time PCR assay targeting the Plasmodium 18s rRNA gene to evaluate temporal trends in the prevalence of all human malaria parasites over a 22-year period in a rural village in Tanzania.We tested 2897 blood samples collected in five cross-sectional surveys conducted between 1994 and 2016. Infections with P. falciparum, P. malariae, and P. ovale spp. were detected throughout the study period, while P. vivax was not detected. Between 1994 and 2010, we found a more than 90% reduction in the odds of infection with all detected species. The odds of P. falciparum infection was further reduced in 2016, while the odds of P. malariae and P. ovale spp. infection increased 2- and 6-fold, respectively, compared to 2010. In 2016, non-falciparum species occurred more often as mono-infections. The results demonstrate the persistent transmission of P. ovale spp., and to a lesser extent P. malariae despite a continued decline in P. falciparum transmission. This illustrates that the transmission patterns of the non-falciparum species do not necessarily follow those of P. falciparum, stressing the need for attention towards non-falciparum malaria in Africa. Malaria elimination will require a better understanding of the epidemiology of P. malariae and P. ovale spp. and improved tools for monitoring the transmission of all Plasmodium species, with a particular focus towards identifying asymptomatic carriers of infection and designing appropriate interventions to enhance malaria control.

Indexed as

AdolescentAdultAgedAged, 80 and overChildChild, PreschoolDNA, ProtozoanFemaleHumansInfantMalariaMaleMiddle AgedPlasmodium falciparumPlasmodium malariaePlasmodium ovaleDNA, ProtozoanRNA, Ribosomal, 18S

Identifiers

PMID31136585
PMCPMC6555537

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.