General Information on Zika Virus

Information about Zika virus continues to evolve as public health officials and scientists learn more about its transmission and effects. Current efforts in the U.S. are focused on protecting and diagnosing pregnant or potentially pregnant women.

What is Zika virus?

Zika virus is a mosquito-borne, single-stranded RNA of the Flaviviridae family. About one in five people become symptomatic with this arbovirus (ARthropod-BOrne virus). The most common symptoms include acute onset of fever, rash, joint pain, and conjunctivitis. Severe disease requiring hospitalization is uncommon. There are no known deaths directly attributable to Zika.

Where has Zika been found?

There are no reports of locally transmitted, vector-borne Zika virus in the continental United States. Cases have been reported in travelers returning to the U.S. Locations of reported Zika virus in the U.S. are shown on this map. The mosquito vector that transmits Zika virus does occur in the U.S.

Locally transmitted Zika virus has been reported in the Commonwealth of Puerto Rico, the U.S. Virgin Islands, and America Samoa. Local transmission is currently occurring in many countries in the Americas.

Outbreaks are currently occurring in many countries as shown on this map.

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