Scientists don't know all the conditions linked to the Zika virus. In one lab in Cali, Colombia, researchers are trying to connect Zika and the neurological condition Guillain Barre.
Director Matthew Heineman embedded himself up close in the action — and the moral ambiguity — of citizen groups who are fighting back against drug cartels in Mexico.
When is a migrant a refugee? The answer comes down to how U.S. judges read one sentence in a 1980 law. Each ruling could mean the difference between life and death for thousands of Central Americans.
Researchers say Colombia offers a chance to learn more about Zika's possible link to microcephaly. If the country sees a sudden rise in cases as Brazil did, that's stronger evidence of a connection.
Venezuela is a key supplier of baseball talent to the U.S. major leagues. Players come up through baseball academies run by the teams. But now, many academies are being shut down.
The scale of the Zika virus outbreak in Venezuela is unclear. The government is reporting more than 5,000 cases with three related deaths. But independent Venezuelan physicians fear it could be as many as 400,000 infections. The outbreak is occurring in a country with a collapsing medical system, an economy in tatters and no funds to buy mosquito repellant, contraception or medicine.