Altered behavioral responses of Sindbis virus-infected Aedes aegypti (Diptera: Culicidae) to DEET and non-DEET based insect repellents

Changes in the time to first bite (TFB) and the bloodfeeding behavior of adult female Aedes aegypti (L.) mosquitoes following dissemination of Sindbis virus (SINV) were observed after exposure to repellents with the active ingredients (AI) DEET, picaridin, 2-undecanone (2-U), and oil of lemon eucalyptus. Dissemination of SINV significantly decreased (P < 0.0001) the TFB of DEET (15%) and picaridin (15%) by 46% and 37%, respectively. Significant (P < 0.0001) changes in activation, probing, and engorgement times were observed in SINV infected mosquitoes after exposure to the four repellents compared to uninfected mosquitoes. Taken together, a decrease in TFB and time to complete the four bloodfeeding stages will lessen the prey-status, and enhance both the chances of mosquito survival and arbovirus transmission.

Changes in the complete protection time and bloodfeeding behavior of Aedes aegypti following dissemination of Sindbis virus were observed after exposure to DEET and non-DEET repellents.Figure optionsDownload as PowerPoint slideHighlights
► We evaluated four repellents on Sindbis virus disseminated Aedes aegypti behavior.
► We evaluated the four stages of bloodfeeding and complete protection time.
► Repellent use may not prevent infected mosquitoes from biting.