Study catches ‘high-flying’ mosquitoes spreading pathogens, PgII

Key Highlights:

• Researchers discovered that high-flying mosquitoes, captured 120-290m above ground in Mali and Ghana between 2018 and 2020, carry various pathogens.
• The study screened 1,017 female mosquitoes of 61 species and found that approximately 8% carried Plasmodium parasites, 3.5% carried flaviviruses, and 1.6% carried filarial worms.
• The team identified 21 mosquito-borne pathogen types infecting vertebrates, including dengue virus, West Nile virus, and M’Poko virus.
• Significant percentages of high-flying mosquitoes showed signs of disseminated infection in head and thorax tissues: 4.6% for Plasmodium, 1.1% for flaviviruses, and 0.6% for filariae.

Detailed Insights:

• The study challenges the assumption that pathogens spread primarily through infected human or animal travel, highlighting high-flying mosquitoes as a potential long-distance transmission route.
• Researchers used nets attached to helium balloons to capture mosquitoes at altitudes of 120 to 290 meters above ground in West Africa over 191 nights.
• Pathogens found in the head and thorax indicate the mosquitoes' potential to infect new hosts, suggesting a need to monitor prevailing wind corridors and downwind areas during transmission seasons.
• The discovery of sylvatic pathogens, circulating among wild animals, suggests that ground-level monitoring alone may be insufficient for tracking disease spread, especially in wild hosts.
• The findings suggest that public health strategies should consider high-altitude mosquito movement and implement rapid responses when infections appear in new locations.

Key Concepts Involved:

• Pathogen: A bacterium, virus, or other microorganism that can cause disease.
• Sylvatic: Existing in or affecting wild animals.
• Disseminated Infection: An infection that has spread from its original site to other parts of the body.