Study: Mosquitoes Can Learn to Like DEET

Is DEET's effectiveness undermined by mosquito learning or can smart reapplication habits keep it reliable?
Study: Mosquitoes Can Learn to Like DEET
Above: A teenager applies insect repellent to exposed skin to prevent mosquito bites. Image credit: Smith Collection/Gado/Getty Images

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.

© 2026 Improve the News Foundation. All rights reserved.Version 7.16.0

© 2026 Improve the News Foundation.

All rights reserved.

Version 7.16.0