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Zika Virus
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Infections

Zika Virus

Zika is a mosquito-borne virus that can cause serious birth defects and is primarily managed through symptom relief and bite prevention.

Overview

Zika is a virus spread mostly by mosquitoes. It can also be transmitted from a pregnant mother to her baby during pregnancy or around the time of birth, through sexual contact, and through blood transfusions. Outbreaks have been reported in the United States, Africa, Southeast Asia, the Pacific Islands, parts of the Caribbean, and Central and South America.

Symptoms

Most people infected with the virus do not get sick. When symptoms do occur, they typically appear 2 to 7 days after an infected mosquito bite and are usually mild. Symptoms may include:

  • Fever
  • Rash
  • Joint pain
  • Conjunctivitis (pink eye)

Diagnosis and Treatment

A blood test can determine if you have the infection. There are currently no vaccines or medicines to treat Zika. Management focuses on supportive care, including resting, drinking plenty of fluids, and taking acetaminophen.

Prevention and Pregnancy

Zika can cause microcephaly—a serious birth defect of the brain—and other complications in babies born to mothers infected during pregnancy. The Centers for Disease Control and Prevention advises pregnant women to avoid travel to areas with active Zika outbreaks. If travel is necessary, consult a doctor first. To prevent mosquito bites, take the following precautions:

  • Use insect repellent.
  • Wear clothing that covers your arms, legs, and feet.
  • Stay in environments with air conditioning or those that utilize window and door screens.

Frequently Asked Questions

blood test (RT‑PCR) performed within 2 weeks of symptom onset can confirm Zika; later, serologic IgM testing may be used. Treatment is supportive: rest, hydration, and acetaminophen for fever or pain—avoid NSAIDs until dengue is ruled out.
Check the CDC’s travel health website or the local health ministry’s updates for the latest Zika activity maps. Look for recent reports of mosquito‑borne disease outbreaks and follow any travel advisories before you depart.
Yes. Even if you have no symptoms, request Zika testing (PCR or IgM serology) from your obstetric provider because asymptomatic infection can still affect the fetus.
Zika can be spread sexually. Men should use condoms or abstain for at least 3 months after symptom onset (or after a positive test if asymptomatic). Women should use protection for at least 2 months.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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