The data displays the number of countries and territories that had reported mosquito-borne Zika virus transmission as of February 15, 2018, by WHO region. As of this time the total number of countries/territories that had reported mosquito-borne Zika virus transmission had reached 86, of which 49 were in the Americas. In 2015 Brazil saw a sharp rise in cases of microcephaly among newborns believed to be connected with the spreading of the Zika virus. Although cases of the Zika virus had been on the rise since 2015, malaria still remained the most serious of the mosquito-borne diseases for at-risk populations worldwide.
