Officials from the Centers for Disease Control and Prevention reported nine confirmed cases of Zika in pregnant women in the U.S., NBC News reports.
According to the CDC, all nine women reported some of the commonly observed symptoms of the virus. Four pregnancies ended in miscarriage or abortion, one baby was born with severe brain defects and two women are still pregnant with apparently healthy babies.
The CDC is also investigating 10 more suspected cases.
"We did not expect to see these brain abnormalities in this small case series of U.S. pregnant travelers," Dr. Denise Jamieson, who is assisting the CDC, told reporters. "It is unexpected and greater than what we would have expected."