Mosquitoes Use Specific Scent Receptor to Detect and Avoid Natural Repellent

New research reveals how mosquitoes' sense of smell helps them evade plant-based deterrents.

Published on Mar. 11, 2026

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A study led by researchers at Baylor University has discovered that mosquitoes use a specific odor receptor called OR49 to detect and avoid borneol, a naturally occurring compound found in aromatic plants like camphor trees and rosemary. When mosquitoes encounter borneol, OR49 triggers a neural response that causes them to steer clear, providing a natural warning system. By understanding this biological mechanism, scientists hope to develop more effective and targeted mosquito repellents to protect against mosquito-borne diseases.

Why it matters

Mosquito-borne illnesses like dengue, malaria and Zika continue to threaten millions worldwide. This research provides crucial insight into how mosquitoes' sense of smell helps them detect and avoid natural repellents, which could lead to the development of smarter, more effective deterrents to protect public health.

The details

The research team, led by Baylor University biologist Jason Pitts, found that Aedes aegypti mosquitoes - one of the most widespread disease-carrying mosquito species - have a specialized odor receptor called OR49 that is highly sensitive to borneol. When mosquitoes encounter this compound, OR49 triggers a neural signal that travels to a specific region of the insect's brain, causing it to avoid the scent. To test the importance of this receptor, the researchers genetically disabled OR49, and found that without it, the mosquitoes no longer responded to or avoided borneol.

  • The study was published in the journal Nature Communications on March 11, 2026.

The players

Jason Pitts

An associate professor of biology at Baylor University and a corresponding author on the study.

Aedes aegypti

One of the most widespread mosquito species in the world and a major carrier of dengue, malaria and Zika viruses.

OR49

The specific odor receptor in Aedes aegypti mosquitoes that is highly sensitive to the natural repellent compound borneol.

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What they’re saying

“Because the repellency through the Or49 receptor is so strong, we might be able to identify other volatile odors that activate the same receptor to 'push' mosquitoes away from people.”

— Jason Pitts, Associate Professor of Biology (Mirage News)

“The knowledge gained in these studies will inform similar studies in mosquitoes that transmit malaria, plus other biting insects that continue to exert negative impacts on human flourishing on a global scale.”

— Jason Pitts, Associate Professor of Biology (Mirage News)

What’s next

Researchers plan to use this new understanding of how mosquitoes detect and avoid natural repellents to develop more targeted and effective mosquito deterrents that could be used in personal protective formulations, devices, and mosquito traps to enhance surveillance and control efforts.

The takeaway

This research provides crucial biological insights into how mosquitoes' sense of smell helps them detect and avoid natural repellents, which could lead to the development of smarter, more effective ways to protect people from mosquito-borne diseases like dengue, malaria and Zika.