2021 Case Counts in the US

2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015


See Also

Provisional Data as of July 27, 2021
Zika virus disease is a nationally notifiable condition. Cases are reported to CDC by state, territorial, and local health departments using standard case definitions. This webpage contains provisional data reported to ArboNET for 2021.

US States

  • 0 Zika virus disease cases reported*
    • 0 cases in travelers
    • 0 cases acquired through presumed local mosquito-borne transmission
    • 0 cases acquired through sexual transmission
    • 0 case acquired through laboratory exposure

US Territories

  • 17 Zika virus disease cases reported*
    • 0 cases in travelers returning from an affected area
    • 17 cases acquired through presumed local mosquito-borne transmission
    • 0 cases acquired through other routes†

Presumed locally acquired cases of Zika in the U.S. territories were diagnosed using serologic testing, which detects antibodies against Zika. Since antibodies against Zika can persist for years after infection, serology cannot distinguish between a recent or past infection. Additionally, Zika and dengue virus antibodies cross-react, making it difficult to diagnose which virus is the cause of the current illness. None of these probable cases have tested positive using molecular testing, which detects the presence of the virus in the body and is the best indicator of a recent infection. In 2021, there have been no confirmed Zika virus disease cases reported from U.S. territories. Additionally, a large number of suspect Zika cases from the territories have been tested using molecular testing and none have been positive.