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  • Prior to 2014, very few travel-associated cases of Zika virus disease were identified in the United States.
  • In 2015 and 2016, large outbreaks of Zika virus occurred in the Americas, resulting in an increase in travel-associated cases in US states, widespread transmission in Puerto Rico and the US Virgin Islands, and limited local transmission in Florida and Texas.
  • In 2017, the number of reported Zika virus disease cases in the United States started to decline.
  • In 2018 and 2019, there have been no reports of Zika virus transmission by mosquitoes in the continental United States.
  • In 2019, there have been no confirmed Zika virus disease cases reported from United States territories.

Yearly case counts for US states and territories

*CDC reports provisional Zika virus disease case counts reported to ArboNET for the United States and its territories on the first Thursday of each month.

CDC Disease Maps
CDC Disease Maps

Map of the United States showing WNV Human disease cases.

National & state maps (including county-level data) from 2003 – present.

Page last reviewed: November 7, 2019
Content source: Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases (NCEZID), Division of Vector-Borne Diseases (DVBD)