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Basics

Couple hands on pregnant belly

Zika is a virus spread to people primarily through the bite of an infected mosquito. Zika infection during pregnancy can cause serious birth defects.

What we know

  • Zika virus can be passed from a pregnant woman to her fetus.
  • Infection during pregnancy can cause a birth defect called microcephaly and other severe fetal brain defects.
  • Zika primarily spreads through infected mosquitoes. You can also get Zika through sex without a condom with someone infected by Zika, even if that person does not show symptoms of Zika.
  • There is no vaccine to prevent or medicine to treat Zika.
  • Pregnant women should not travel to areas with risk of Zika.

What we do not know

  • How likely it is that Zika infection will affect your pregnancy.
  • If your baby will have birth defects if you are infected while pregnant.
  • The full range of health effects that Zika virus infection during pregnancy might lead to.
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