The potential societal risk of Zika virus can be delimited by the distribution of the mosquito species that transmit it. The global distribution of the most cited carrier of Zika virus, A. aegypti, is expanding due to global trade and travel.[30] A. aegypti distribution is now the most extensive ever recorded – across all continents including North America and even the European periphery (Madeira, the Netherlands, and the northeastern Black Sea coast).[31] A mosquito population capable of carrying the Zika virus has been found in a Capitol Hill neighborhood of Washington, D. C., and genetic evidence suggests they survived at least four consecutive winters in the region. The study authors conclude that mosquitos are adapting for persistence in a northern climate