The Centers for Disease Control and Prevention today reported an increase last year in the number of U.S. counties with evidence of the Aedes mosquitoes that can spread chikungunya, dengue and Zika viruses. The 2016 data added Aedes aegypti collection records from 38 new counties and Aedes albopictus collection records from 127 new counties, a 21% and 10% increase, respectively, from the previous report. CDC said the study highlights the need for continued mosquito surveillance and can help state and local health departments and mosquito control districts plan for possible outbreaks. The CDC study was reported in the Journal of Medical Entomology.