A woman who is six months pregnant shows a photo of her ultrasound at the IMIP hospital in Recife, Pernambuco state, Brazil, on Wednesday. Scientists are trying to figure out how Zika virus may be affecting fetuses.
Researcher Beatriz Parra Patino (right) prepares to test the blood and urine of patients with Guillain-Barre syndrome to see if they had Zika virus as well. She's been working seven days a week, up to 14 hours a day, to test samples as quickly as possible.
Protected from bites by a mosquito net, this pregnant woman, in her second trimester, came into the hospital in Cucuta, Colombia, with symptoms of Zika. A blood test is being run to find out if she has the virus.
These people have just walked across the bridge from Venezuela to Colombia, where the Colombian immigration authorities are on duty. Many people live on one side and work on the other, crossing so frequently they don't have to register with officials each time.
Vladimir Solano for NPR