Linkages between Zika and microcephaly/other neurological conditions have nearly been confirmed. Microcephaly continues to be detected in persons living in and traveling to affected countries in South and Central America. Brazil has the highest burden of Aedes aegypti mosquitos and for this reason has experienced a high rate of Zika and subsequent microcephaly. Other countries in the region with heavy mosquito populations include Venezuela, Nicaragua, Costa Rica, El Salvador, French Guiana, Honduras, Colombia, and Puerto Rico.
Many of these countries are seeing and will continue to see an increase in mosquito-borne activity in the weeks ahead. A large-scale international response will need to be sustained over the next 3+ months as waves of Zika-related microcephaly are expected to be reported.
Mosquito-borne disease activity is heightened in Brazil and Puerto Rico and is forecast to increase in March.