A county-level survey conducted in 2015 and 2016 by the U.S. Centers for Disease Control and Prevention shows the historic occurrence of Aedes albopictus mosquitoes between January 1995 and December 2016 in the United States. Counties with black dots had new, previously unreported surveillance records in the second round of the survey in 2016, reflecting increased attention on surveillance for mosquitoes. “Prompted by the Zika outbreak, states began work to better assess the distribution and abundance of these mosquitoes, locally,” says Rebecca Eisen, Ph.D., research biologist with CDC’s Division of Vector-Borne Diseases. (Note: The map indicates presence, not abundance, of Ae. albopictus, and the map does not indicate levels of risk for the spread of any specific disease.) (Image credit: CDC)