What we know
- Pregnant women can be infected with Zika virus.
- The primary way that pregnant women get Zika virus is through the bite of an infected mosquito.
- Zika virus can be spread by a man to his sex partners.
- A pregnant woman can pass Zika virus to her fetus.
- Zika virus can be passed from a pregnant woman to her fetus during pregnancy or at delivery.
What we do not know
- If a pregnant woman is exposed
- We don’t know how likely she is to get Zika.
- If a pregnant woman is infected
- We don’t know how the virus will affect her or her pregnancy.
- We don’t know how likely it is that Zika will pass to her fetus.
- We don’t know if the fetus is infected, if the fetus will develop birth defects.
- We don’t know when in pregnancy the infection might cause harm to the fetus.
- We don’t know whether her baby will have birth defects.
- We don’t know if sexual transmission of Zika virus poses a different risk of birth defects than mosquito-borne transmission.
Zika in the US