Vaccines have saved more than 154 million lives worldwide over the past 50 years. World Immunization Week is a timely ...

A "smoky umbrella" blocked the sun's rays and worsened air pollution in New York and New Jersey during the event. Here's how.

Canada has reported more than 730 cases this year, making this one of the worst measles outbreaks in the country since it ...

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