Mosquitos (IMAGE) Stanford University Caption Workers in Ecuador spray insecticide to kill Aedes aegypti mosquitoes, which spread dengue, chikungunya and Zika diseases. Stanford scientists are researching the temperatures that promote mosquito activity. Credit Dany Krom Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.