Cited by 532Malaria Research and ControlBird parasitology and diseasesHemoglobinopathies and Related Disorders

Submicroscopic Infection in Plasmodium falciparum –Endemic Populations: A Systematic Review and Meta‐Analysis

Okell, Lucy C., Ghani, Azra C., Lyons, Emily, Drakeley, Chris J.·2009·The Journal of Infectious Diseases

Abstract

INTRODUCTION: Light microscopy examination of blood slides is the main method of detecting malaria infection; however, it has limited sensitivity. Low-density infections are most likely to be missed, but they contribute to the infectious reservoir. Quantifying these submicroscopic infections is therefore key to understanding transmission dynamics and successfully reducing parasite transmission. METHODS: We conducted a systematic review of endemic population surveys in which P. falciparum prevalence had been measured by both microscopy and a more-sensitive polymerase chain reaction (PCR)-based technique. The combined microscopy:PCR prevalence ratio was estimated by random-effects meta-analysis, and the effect of covariates was determined by meta-regression. RESULTS: Seventy-two pairs of prevalence measurements were included in the study. The prevalence of infection measured by microscopy was, on average, 50.8% (95% confidence interval [CI], 45.2%-57.1%) of that measured by PCR. For gametocyte-specific detection, the microscopy prevalence was, on average, 8.7% (95% CI, 2.8%-26.6%) of the prevalence measured by PCR. A significantly higher percentage of total infections was detected by microscopy in areas of high, compared with low, transmission (74.5% when the prevalence determined by PCR was >75% versus 12.0% when the prevalence determined by PCR was <10%). DISCUSSION: Microscopy can miss a substantial proportion of P. falciparum infections in surveys of endemic populations, especially in areas with low transmission of infection. The extent of the submicroscopic reservoir needs to be taken into account for effective surveillance and control.

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  1. Coleman RE, Kumpitak C, Ponlawat A, et al. Infectivity of asymptom- atic Plasmodium-infected human populations to Anopheles dirus mos- quitoes in western Thailand. J Med Entomol 2004; 41:201-8.
  2. Brenner H, Gefeller O. Variation of sensitivity, specificity, likelihood ratios and predictive values with disease prevalence. Stat Med 1997; 16:981-91.

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Authors
Okell, L. C., Ghani, A. C., Lyons, E., & Drakeley, C. J.
Affiliations
  • London School of Hygiene & Tropical Medicine (GB)
  • Imperial College London (GB)
Corresponding author
Okell, Lucy C.
Venue
The Journal of Infectious Diseases
Published
2009-11-15
Volume
200
Issue
10
Pages
1509-1517
ISSN
  • 0022-1899 (ISSN-L)
  • 1537-6613
OpenAlex
W2125263196
Cited by
532
References
158
Citations by year
2026: 13 · 2025: 26 · 2024: 21 · 2023: 24 · 2022: 30 · 2021: 38 · 2020: 39 · 2019: 36 · 2018: 34 · 2017: 39 · 2016: 43 · 2015: 46 · 2014: 34 · 2013: 40 · 2012: 30
FWCI
3.03
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Infectious Diseases (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust
  • Medical Research Council
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Malaria Research and Control
  • Life Sciences › Immunology and Microbiology › Parasitology › Bird parasitology and diseases
  • Health Sciences › Medicine › Genetics › Hemoglobinopathies and Related Disorders
Keywords
Plasmodium falciparum, submicroscopic malaria infection, malaria prevalence, PCR detection, gametocytes, infectious reservoir, transmission intensity, malaria surveillance, endemic populations
MeSH terms
Disease Reservoirs, Humans, Prevalence, Polymerase Chain Reaction, Malaria, Falciparum, Endemic Diseases

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