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What is Zika?

Zika is a disease caused by a virus spread to people through mosquito bites. Outbreaks of Zika have occurred in areas of Africa, Southeast Asia, the Pacific Islands, and the Americas. See Zika Travel Information for information on countries and territories with Zika.

Many people infected with Zika virus do not get sick. Among those who develop symptoms, sickness is usually mild, with symptoms that last for several days to a week. Guillain-Barré syndrome (GBS), a rare disorder that can cause muscle weakness and paralysis for a few weeks to several months, is very likely triggered by Zika for a small number of people, much as it is after  other infections. Most people fully recover from GBS, but some have permanent damage.

Zika Virus in Pregnancy

A pregnant woman can pass Zika virus to her fetus. Infection during pregnancy can cause severe birth defects. CDC recommends special precautions for the following groups:

  • Women who are pregnant:
    • Should not travel to any area below 6,500 feet in an area with epidemic Zika.
    • If you must travel to one of these areas, talk to your doctor first and strictly follow steps to prevent mosquito bites during your trip. If your itinerary is limited entirely to areas above 6,500 feet, there is minimal risk of getting Zika from a mosquito.
    • If you have a male partner who lives in or has traveled to an area with Zika, either use condoms or do not have sex (vaginal, anal, or oral) during your pregnancy.
  • Women who are trying to become pregnant:
    • Before you or your male partner travel to an area with epidemic Zika, talk to your doctor about your plans to become pregnant and the risk of Zika virus infection.
    • See CDC guidance for how long you should wait to get pregnant after travel to an area with epidemic Zika.
  • Men who have traveled to an area with epidemic Zika and have a pregnant partner should use condoms or not have sex (vaginal, anal, or oral) during the pregnancy.


What can travelers do to prevent Zika?

There is no vaccine or medicine for Zika. Travelers can protect themselves by preventing mosquito bites:

  • Cover exposed skin by wearing long-sleeved shirts and long pants.
  • Use EPA-registered insect repellents containing DEET, picaridin, IR3535, oil of lemon eucalyptus (OLE), or para-menthane-diol (PMD). Always use as directed.
    • When used as directed, EPA-registered insect repellents are safe and effective for use by pregnant and breastfeeding women.  
    • Most repellents, including DEET, can be used on children aged older than 2 months. (OLE and PMD should not be used on children younger than 3 years.)
    • Use permethrin-treated clothing and gear (such as boots, pants, socks, and tents). You can buy pre-treated clothing and gear or treat them yourself.
    • Stay in places with air conditioning and window and door screens to keep mosquitoes outside.
    • Sleep under a mosquito bed net if air conditioned or screened rooms are not available or if sleeping outdoors.
    • Mosquito netting should be used to cover babies younger than 2 months old in carriers, strollers, or cribs to protect them from mosquito bites.

A man infected with Zika can pass it to his partners through sex.   If you have sex (vaginal, anal, or oral) with a man while traveling, you should use condoms.

After travel:

Many people infected with Zika virus do not feel sick. If a mosquito bites an infected person while the virus is still in that person’s blood, it gets infected and can spread the virus when biting another person.  Even if they do not feel sick, travelers returning to the United States from an area with Zika should take steps to prevent mosquito bites for 3 weeks so that they do not spread Zika to mosquitoes, who can then spread Zika to other people.

Men who have traveled to an area with epidemic Zika should use condoms for 8 weeks to protect their sex partners. Men who develop Zika symptoms or are diagnosed with Zika should use condoms for 6 months. If the man’s partner is pregnant, the couple should either use condoms or not have sex during the pregnancy.

Women who have traveled to an area with epidemic Zika but don’t have symptoms should wait 8 weeks after travel before trying to get pregnant. Women who also have Zika symptoms should wait at least 8 weeks after symptoms start before trying to get pregnant.

For more information, see Zika and Sexual Transmission.

Pregnant women should talk to their doctor about testing for Zika (see below).

If you feel sick and think you may have Zika:

  • Talk to your doctor if you develop a fever with a rash, joint pain, or red eyes. Tell him or her about your travel.
  • Take acetaminophen (paracetamol) to relieve fever and pain. Do not take aspirin, products containing aspirin, or other nonsteroidal anti-inflammatory drugs such as ibuprofen until dengue can be ruled out.
  • Get lots of rest and drink plenty of liquids.

If you are pregnant:

After you travel return from areas with epidemic Zika, you can be tested for Zika virus infection.

  • If you develop a fever with a rash, joint pain, or red eyes, talk to your doctor immediately and tell him or her about your travel.
  • If you do not have symptoms, testing can be considered 2‑12 weeks after you return from travel.

Clinician Information

Health care providers should be alert to pregnant patients returning from countries or territories with epidemic Zika. Clinicians should test pregnant women with symptoms of Zika during or within 2 weeks of travel. Asymptomatic pregnant women who have traveled to areas with epidemic Zika can also be offered testing.

  • For pregnant women with symptoms of Zika, testing is recommended at the time of clinical illness.
  • For asymptomatic pregnant women, testing can be offered 2–12 weeks after return from travel.

See CDC's Updated Guidelines for Health Care Providers Caring for Pregnant Women and Women of Reproductive Age during Ongoing Zika Virus Transmission for additional recommendations related to Zika testing and follow-up care.

Guidelines for infants whose mothers have possible Zika virus infection are also available.

Additional Resources

For Travelers:

Clinician Information: