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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.
The Zika virus' incubation period is about three to 12 days after the bite of an infected mosquito. The vast majority of infections are not contagious from person to person; however, it may be passed person to person during sex. The Zika virus symptoms and signs are usually fever, rash, joint pain, and. conjunctivitis. The virus infection is usually diagnosed by the patient's history and physical exam and by blood testing (testing for the virus genome; usually done in the United States by the Centers for Disease Control and Prevention [CDC]).