With one-fifth of states seeing active measles outbreaks, the U.S. is nearing 900 cases, according to figures posted Friday ...

New research shows that microplastics have been contaminating some freshwater streams decades earlier than previously ...

Texas has more than 600 known cases of measles on Tuesday as the outbreak in the western part of the state approaches the ...

Perhaps nowhere on the globe are these two waves of migration converging more starkly than in Mexico City, a vast urban ...

Belize has confirmed its first measles cases since 1991, traced to recent travelers from Mexico, prompting increased health ...

Montana is the ninth U.S. state to have an active measles outbreak. The U.S. was up to 800 cases of measles nationwide on Friday.

In North America, an outbreak in Ontario, Canada has sickened 925 from mid-October through April 16. That's on top of cases ...