The virus has become more aggressive, increasing the threat of lifelong problems.
A new report from the CDC suggests the mosquito-borne virus has spiked the risk of births with microcephaly and related defects.
Urging pregnant women to apply bug repellent isn't thrilling work for doctors. But it's about all they've got.
Populations in Nigeria, India and Indonesia are at particular risk of outbreaks.
Microcephaly is not detectable until late in the pregnancy, at a time after which many states have banned abortion.
The agency said its decision to expand blood screening in the United States was, in part, based on concerns about more cases of local transmission in Florida,
The baby's mother was infected with the mosquito-borne virus in Latin America.
While Tinder reigned at the Sochi Games, the mosquito-borne illness is set to take over Olympics culture in Rio de Janeiro.
The British No.1 wants to consult doctors before deciding on Olympic involvement.
Health officials say a fetus had severe congenital defects and also tested positive for the mosquito-borne virus.
The Australian golfer has pulled out of Rio partly for this reason.
If confirmed, it would be Africa's first case of Zika-related microcephaly.
A new study conducted with cell cultures shows how the mosquito-borne virus may slow down and stop neural cell growth.
A group of Brazilian doctors suspected the connection between Zika and microcephaly months ago, but had to persuade their government, and the world, that they were onto something real.
The CDC reported outcomes on several pregnant U.S. residents who acquired the virus while traveling in affected countries.
Pope Francis added that he still considers abortion a crime.