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What Parents Should Know about Zika

What we know about Zika

  • Infants and children can be infected with Zika.
    • The primary way that infants and children get Zika is through bites of two types of mosquitoes. Information on safely preventing mosquito bites can be found below or at CDC's Avoid Mosquito Bites page.
    • To date, no cases of Zika have been reported from breastfeeding. Because of the benefits of breastfeeding, mothers are encouraged to breastfeed, even in areas where Zika virus is found.
    • Common symptoms of Zika are fever, rash, joint pain, and red eyes. Symptoms usually go away within a few days to one week. Many people infected with Zika don’t have symptoms.
    • There is no vaccine or medicine for Zika. For more information about treatment and prevention.
  • Birth defects, including microcephaly, and other problems have been reported in babies born to women infected with Zika during pregnancy.
    • Zika virus can be passed from a woman to her fetus during pregnancy or around the time of birth. We are studying how Zika virus affects pregnancies.
    • Since May 2015, Brazil has had a large outbreak of Zika. During this outbreak, Brazilian officials reported an increase in the number of babies born with microcephaly in areas with Zika. Recently, CDC concluded that Zika virus infection during pregnancy is a cause of microcephaly and other severe fetal brain defects.
    • Pregnancy loss and other pregnancy problems have been reported in women infected with Zika during pregnancy. Zika has been linked with other birth defects, including eye defects, hearing loss, and impaired growth.
    • Some infants with congenital Zika virus infection may not be born with microcephaly but later experience slowed head growth and develop postnatal microcephaly.
    • Not all babies whose mothers had Zika during pregnancy are born with health problems. Researchers are working to better understand how often having Zika during pregnancy causes problems.
    • Infection with Zika virus at later times, including around the time of birth or in early childhood, has not been linked to microcephaly.
  • Microcephaly happens for many reasons, and many times the cause is unknown.
    • Genetic conditions, certain infections, and toxins can cause microcephaly. If your child has microcephaly, his or her doctor or other healthcare provider will look for the underlying reason. However, for about half of children with microcephaly, the underlying cause is never discovered.
    • If you have a child with microcephaly, it is unlikely that it had to do with Zika if you did not travel to an area with Zika during pregnancy.
    • Although head size reflects brain size, head size does not always predict short- or long-term health effects. While some children with microcephaly can have seizures, vision or hearing problems, and developmental disabilities, others do not have health problems.

What we don’t know about Zika

  • We do not know how often Zika is passed from a woman to her fetus during pregnancy or around the time of birth.
  • We do not know whether the timing of the woman’s Zika virus infection during pregnancy, or the severity of a woman’s symptoms, affect her pregnancy.
  • We do not know the long-term health outcomes for infants and children with Zika virus infection.

What CDC is doing to learn more

  • Developing laboratory tests to diagnose Zika as quickly as possible.
  • Conducting research on the link between Zika and microcephaly.
  • Identifying new areas with Zika and establishing a US Zika Pregnancy Registry to improve our understanding of the how Zika affects mothers and their children.
  • Testing different mosquito species to find out whether they carry Zika.
  • Providing advice to US travelers returning from areas with current outbreaks; and, supporting US states and territories already affected by Zika.
  • Preparing states and Americans with prevention actions in advance of mosquito season.

What parents can do

  • Prevent mosquito bites.
    To protect your child from mosquito bites
    • Dress your child in clothing that covers arms and legs.
    • Cover crib, stroller, and baby carrier with mosquito netting.
    • Do not use insect repellent on babies under 2 months of age.
    • Do not use products containing oil of lemon eucalyptus or para-menthane-diol on children younger than 3 years old.
    • In children older than 2 months, do not apply insect repellent onto a child’s hands, eyes, mouth, or to irritated or broken skin.
    • Never spray insect repellent directly on a child’s face. Instead, spray it on your hands and then apply sparingly, taking care to avoid the eyes and mouth.
  • Control mosquitoes inside and outside your home.
  • If your child has symptoms, take him or her to see a doctor or other healthcare provider.
    For children with Zika symptoms of fever, rash, joint pain, or red eyes who have traveled to or resided in an affected area, contact your child’s health care provider and describe where you have traveled.
    • Fever (≥100.4° F) in a baby less than 2 months old always requires evaluation by a medical professional. If your baby is less than 2 months old and has a fever, call your health care provider or get medical care.
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