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

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

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… ...

State vaccine requirements span from child care through college, with updated rules on exemptions and access to low-cost clinics ...

Kentucky has its first measles outbreak of 2025, as the U.S. case count sits just short of a 30-year high. There have been 1,267 confirmed measles cases this year, the Centers for Disease Control ...

Health officials in Illinois and North Dakota say their states' measles outbreaks are over, pointing to a continuing slowdown ...