Zika virus

The women being monitored now include those who had positive lab tests but no symptoms, according to the CDC. Also affected are 122 women in U.S. territories, almost all in Puerto Rico.

The extended debate in Congress over emergency funding for a response to the Zika virus is forcing public health departments to cut existing prevention and treatment programs.

Mosquito season is just getting underway in the U.S., and some areas have the mosquitoes that transmit the Zika virus. Pregnant women in places like Florida and Texas are at greatest risk.

Guillain-Barre syndrome can render healthy people temporarily paralyzed. It's something you're likely to hear more about as Zika continues to spread. And for those who get it, it is one wild ride.

Experiments on mice have given scientists an understanding of how the virus causes severe brain malformations.

Mosquitoes infected with Zika haven't turned up along the U.S. Gulf Coast yet, but could thrive in the region's sultry summer weather. Pregnant women and their doctors are already taking precautions.

Residents of these islands have waged many campaigns against disease-carrying mosquitoes. But there's still not much agreement at public meetings about how the mosquitoes should be controlled.