Texas is driving the highest numbers. An outbreak in West Texas that started nearly three months ago has reached 597 cases.

Health experts fear the measles virus will take hold in other U.S. communities with low vaccination rates and that the spread could stretch on for a year.

The U.S. measles outbreak has reached 800 confirmed cases across 24 states, the Centers for Disease Control and Prevention ...

Health officials in western Washington say a Canadian resident flew into the Seattle-Tacoma International Airport while infected with measles.