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Updated: Jun 3, 2025

Experimental Viral Infection in Adult Mosquitoes by Oral Feeding and Microinjection
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Pathogens spread by high-altitude windborne mosquitoes.

R Bamou1, A Dao2, A S Yaro2

  • 1Laboratory of Malaria and Vector Research, NIAID, NIH. Rockville, MD, USA.

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|January 7, 2025
PubMed
Summary
This summary is machine-generated.

High-altitude windborne mosquitoes carry diverse pathogens, including arboviruses and malaria parasites. This study confirms their infectiousness, revealing a novel aerial network for disease transmission over large distances.

Keywords:
AedesAnophelesCulexPlasmodiumarbovirusdisease-spreaddispersalfilariaehigh-altitude windborne migrationmalariamosquito-borne pathogensurveillance

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Area of Science:

  • Medical entomology
  • Epidemiology
  • Virology
  • Parasitology

Background:

  • Mosquitoes migrating at high altitudes were previously thought to have limited epidemiological significance.
  • The hypothesis that these airborne mosquitoes could spread pathogens over extensive distances remained untested.

Purpose of the Study:

  • To investigate the epidemiological role of high-altitude windborne mosquitoes in pathogen transmission.
  • To identify pathogens carried by these mosquitoes and describe the aerial pathogen-vector network.

Main Methods:

  • Mosquitoes were collected using nets on helium balloons at 120-290m altitude over Mali and Ghana.
  • Screening involved pan-genus qPCR for arboviruses, plasmodia, and filariae, followed by sequencing.
  • A total of 1,017 female mosquitoes from 61 species were analyzed.

Main Results:

  • 7.2% of mosquitoes were infected with plasmodia, 1.6% with filariae, and 3.5% with flaviviruses.
  • Identified pathogens included dengue, West Nile virus, 13 Plasmodium species, and 3 filariids.
  • Disseminated infections with multiple pathogens were found in species like Culex perexiguus and Anopheles squamosus.

Conclusions:

  • High-altitude mosquitoes are commonly infected with infectious pathogens, including arboviruses and malaria parasites.
  • This study provides the first evidence of an aerial pathogen-vector network facilitating long-distance disease spread.
  • The findings suggest a significant role for windborne mosquitoes in pathogen maintenance and outbreak initiation.