Texas' measles outbreak that began in Gaines County in January has now expanded to 709 cases, officials said on May 9.

Katherine Wells, the public health director in Lubbock, Texas, describes her fight to stop the largest measles outbreak since 2000, despite a chaotic reorganization of federal health agencies.

There are more than 1,000 confirmed cases of measles nationwide, the Centers for Disease Control and Prevention reported Friday, as outbreaks of the highly contagious illness spread across Texas and dozens of other states.