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Zika fever (also known as Zika virus disease and simply Zika) is an infectious disease caused by the Zika virus. Most cases have no symptoms, but when present they are usually mild and can resemble dengue fever. Symptoms may include fever, red eyes, joint pain, headache, and a maculopapular rash.
1 About 1 in 5 people infected with Zika virus become ill (i.e., develop Zika). 2  The most common symptoms of Zika are fever, rash, joint pain, or red eyes. 3  Other symptoms include muscle pain, headache, pain behind the eyes, and vomiting.4  The illness is usually mild with symptoms lasting for several days to a week.ymptoms. 1  About 1 in 5 people infected with Zika virus become ill (i.e., develop Zika). 2  The most common symptoms of Zika are fever, rash, joint pain, or red eyes. 3  The illness is usually mild with symptoms lasting for several days to a week. 4  Severe disease requiring hospitalization is uncommon. 5  Deaths due to Zika have not been reported.