The mosquito-borne virus, Zika, has developed in the Western Hemisphere, but the virus already spreads around two dozens of countries and territories. However, the number of Zika cases in the hemisphere this year dropped greatly in the top hit areas. https://spinonews.com/2017/12/14/lot-of-doubts-live-about-the-transmission-and-vaccine-development-of-zika-virus/