North America has three other large outbreaks. The longest, in Ontario, Canada, has resulted in 2,276 cases from mid-October ...

Dropping vaccination rates and changes in U.S. vaccine policy have public health experts concerned that annual measles outbreaks could become more frequent.

Faced with a skeptical religious community at the center of the outbreak, health officials say they may have pushed too hard on vaccine messaging.

Measles is highly contagious. It can lead to serious health problems. But it is preventable by the MMR vaccine.

Health officials in Illinois and North Dakota say their measles outbreaks are over. The U.S. added 21 new cases since July 9. States with active outbreaks include Arizona, Colorado, Georgia, Iowa, ...

There have been more measles cases in the US this year than any other since the disease was declared eliminated a ...

Health officials in Colorado say the state's measles outbreak is over, and the U.S. added just 10 confirmed cases nationally in the last week. Wednesday's national case count stood at 1,319 ...