Zika Virus: Information for States and Territories

At a Glance – Zika in the U.S. (updated 11/29/17*)

U.S. States
Travel-associated Zika virus disease cases reported: 5,313
Locally acquired vector-borne cases reported: 226 
Laboratory acquired cases reported: 1
Pregnant Women with Any Lab Evidence of Zika Virus Infection: 2,311
Liveborn infants with birth defectss: 98
Pregnancy losses with birth defects: 9

Of the 5,590 cases (362 in 2017) reported, 48 were sexually transmitted.

U.S. Territories
Total cases reported: 37,086 (594 in 2017)
Travel-associated cases reported:147
Locally acquired cases reported: 36,939 
Pregnant Women with Any Lab Evidence of Zika Virus Infection: 4,621
Liveborn infants with birth defects: 142
Pregnancy losses with birth defects: 8

*Visit CDC.gov for the most up to date information.This webpage contains cumulative provisional data reported to ArboNET since 1/1/2015.


New from ASTHO: Top Questions on Zika: Simple Answers


Zika virus is a mosquito-borne flavivirus transmitted to humans primarily by the Aedes aegypti mosquitoes, the same mosquitoes that transmit dengue, yellow fever, and chikungunya viruses. CDC estimates that 80 percent of Zika cases are asymptomatic. Symptomatic cases usually result in mild illness and symptoms such as acute onset of fever, rash, joint pain, and conjunctivitis. Some evidence suggests severe outcomes such as Guillian-Barre syndrome and microcephaly in infants via maternal-fetal transmission of Zika virus. There is currently no vaccine to prevent or medicine to treat Zika virus. For more information on Zika virus in the United States see CDC's Zika Virus web page: www.cdc.gov/Zika.


ASTHO staff have compiled the following links to selected resources and background materials that were created by state and territorial health departments and national and international sources for use by state health agency leaders. We'll add to these materials periodically.