Mosquitoes may be drawn to DEET after a feeding experience, study finds

A laboratory study shows mosquitoes can form a learned association between the repellent DEET and a blood meal, with about 60% of trained mosquitoes attempting to bite DEET when later exposed to it. This suggests repellents can be less effective under certain conditions, though experts stress normal use remains valid and travelers should continue reapplying as directed; more research is needed to understand how long such memories last and how this translates outside the lab.