Study: Mosquitoes Can Learn to Like DEET
The Facts
- A study published in the Journal of Experimental Biology on Thursday found that yellow fever mosquitoes (Aedes aegypti) can be trained to associate the smell of the insect repellent DEET with food, potentially shifting their response from aversion to attraction.
- Using Pavlovian conditioning, researchers exposed mosquitoes to DEET while they fed on warm blood. More than 60% of trained mosquitoes later attempted to bite when presented with only the smell of DEET, compared with 17% of untrained insects.
- Trained mosquitoes were drawn toward a researcher's DEET-treated hand, while untrained mosquitoes avoided it entirely. Researchers also found mosquitoes formed the same association when sugar was used as a reward instead of blood.
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The Spin
Narrative A
Evidently, mosquitoes can be conditioned through Pavlovian training to associate DEET's smell with a blood meal, flipping their response from avoidance to attraction. Lab results showed over 60% of trained mosquitoes attempted to bite a DEET-treated hand, while untrained ones avoided it entirely. This reveals DEET has a cognitive vulnerability, not just a chemical one, that demands smarter repellent strategies going forward.
Narrative B
The key practical takeaway from this isn't that DEET fails, it's that regular reapplication keeps concentrations high enough to prevent mosquitoes from ever forming a learned association in the first place. Pair consistent DEET use with smart habits like camping in breezy spots and wearing tightly woven fabrics, and mosquitoes don't stand a chance.
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