The impact of insecticide applications on the dynamics of resistance: The case of four Aedes aegypti populations from different Brazilian regions.

Background: In the tropics, the utilization of insecticides is still an important strategy for controlling Aedes aegypti, the principle vector of dengue, chikungunya and Zika viruses. However, increasing insecticide resistance in Ae. aegypti populations might hinder insecticide efficacy on a long-term basis.