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DEET ( N,N -Diethyl- m -toluamide) is one of the most widely used mosquito repellents. Although DEET has been shown to be extremely effective, recent studies have revealed that certain individual insects are unaffected by its presence. A genetic basis for this has been shown in  Aedes aegypti  mosquitoes and the fruit fly  Drosophila melanogaster , but, for the triatomine bug,  Rhodnius prolixus , a decrease in response to DEET occurred shortly after previous exposure, indicating that non-genetic factors may also be involved in DEET “insensitivity”. In this study, we examined host-seeking behaviour and electrophysiological responses of  A. aegypti  after pre-exposure to DEET. We found that three hours after pre-exposure the mosquitoes showed behavioural insensitivity, and electroantennography revealed this correlated with the olfactory receptor neurons responding less to DEET. The change in behaviour as a result of pre-exposure to DEET has implications for the use of repellents and the ability of mosquitoes to overcome them.

Aedes aegypti Mosquitoes Exhibit Decreased Repellency by DEET following Previous Exposure