For Pregnant Women

Should pregnant women travel to places with Zika outbreaks?

Zika virus can be spread from a pregnant woman to her fetus. There have been reports of a serious birth defect of the brain called microcephaly in babies of mothers who had Zika virus while pregnant. Knowledge of the link between Zika and birth defects is evolving, but until more is known, CDC recommends special precautions for pregnant women.  Pregnant women in any trimester should consider postponing travel to any area where Zika virus is spreading. If you must travel to one of these areas, talk to your healthcare provider first and strictly follow steps to prevent mosquito bites during your trip.Zika Virus

Should women trying to get pregnant travel to places with Zika outbreaks?

Until more is known, CDC recommends that women trying to get pregnant  and their male partners talk to their healthcare provider before traveling to areas with Zika. Because sexual transmission is possible, both men and women should strictly follow steps to prevent mosquito bites during the trip.

Areas where Zika is spreading will likely change over time. Check CDC’s travel website often for a current list of areas with Zika. Specific areas where Zika virus is spreading are often difficult to determine and are likely to change. As more information becomes available, travel notices will be updated. Please check back frequently for the most up-to-date recommendations.

Zika and Pregnancy

Can mothers pass Zika on to their fetuses during pregnancy?

Zika virus can be passed from a mother to her fetus during pregnancy. We are studying how Zika affects pregnancies.

What should a pregnant woman do if she has previously traveled to a place with a Zika outbreak?

Pregnant women who have recently traveled to an area with Zika should talk to a healthcare provider about their travel even if they don’t feel sick. CDC has guidance to help doctors decide what tests are needed for pregnant women who may have been exposed to Zika. CDC recommends that all pregnant women who have traveled to an area with Zika talk to their doctors. It is especially important that pregnant women see a doctor if they develop a fever, rash, joint pain, or red eyes during their trip or within 2 weeks after traveling to a country where Zika has been reported. They should tell the doctor where they traveled.

What should a pregnant woman do if she gets sick during or after travel to a place with a Zika outbreak?

Pregnant women who are worried that they had Zika should talk to their healthcare provider and tell their provider about their recent travel. It is especially important for a pregnant woman to see a doctor if she develops a fever, rash, joint pain, or red eyes during her trip or within 2 weeks after traveling to an area with Zika. CDC has guidance to help doctors decide what tests are needed for pregnant women who may have been exposed to Zika.

Information for healthcare providers can be found on the Zika virus Information for Health Care Providers webpage.

Does Zika in pregnant women cause birth defects?Zika Virus

Brazil has been having a significant outbreak of Zika virus since May 2015. Officials in Brazil have also noted an increase in the number of babies with congenital microcephaly (a birth defect in which the size of a baby’s head is smaller than expected for age and sex) during that time. Congenital microcephaly is often a sign of the brain not developing normally during pregnancy. Health authorities in Brazil, with assistance from the Pan American Health Organization, CDC, and other agencies, have been investigating the association between Zika virus infection and microcephaly.

Additional studies are needed to determine the degree to which Zika is linked with microcephaly. More lab testing and other studies are planned to learn more about the risks of Zika virus infection during pregnancy.

Because of the association between Zika infection and microcephaly, pregnant women should take steps to prevent mosquito bites.

Are there reasons other than Zika that might explain the increase in microcephaly cases in Brazil?Zika Virus

Microcephaly can happen for many reasons, including genetics, maternal infections, and being close to or touching toxins during pregnancy. Results of recent epidemiologic and laboratory studies performed in Brazil strongly support, but don’t yet prove, a link between Zika virus infection during pregnancy and microcephaly.  For example, a report in the MMWR on February 10, 2016, presents findings from pathologic studies showing the presence of Zika virus in the brains of infants born with microcephaly and in placental tissues from early miscarriages.

Several media reports in February 2016 suggested that a pesticide called pyriproxyfen might be linked with microcephaly. These media reports appear to be based on a February 3 publication authored by an Argentine physicians organization, which claims that the use of pyriproxyfen in drinking water in Brazil is responsible for the country’s increase in microcephaly cases.

The World Health Organization has approved the use of pyriproxyfen for the control of disease-carrying mosquitos. Pyriproxyfen is a registered pesticide in Brazil and other countries, it has been used for decades, and it has not been linked with microcephaly.  In addition, exposure to pyriproxyfen would not explain recent study results showing the presence of Zika virus in the brains of infants born with microcephaly.

CDC is working closely with international partners to study infants with microcephaly to better understand what role various factors, including Zika virus, may play in this birth defect.

Effects of Zika on Future Pregnancies

Can a previous Zika infection cause a woman who later gets pregnant to have a baby with microcephaly?

Currently, there is no evidence to suggest that Zika virus, after it is cleared from the blood, poses a risk of birth defects for future pregnancies. Zika virus usually remains in the blood of an infected person for about a week.

Is it safe to get pregnant after traveling to a place with a Zika outbreak?

Women thinking about getting pregnant who have recently traveled to an area with Zika should talk to their healthcare provider. Once a person becomes sick, Zika virus usually remains in the blood for about a week. Zika virus has been found in semen longer.