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.

More than 700 cases of measles have been confirmed in an outbreak across Texas, state health officials reported Tuesday, as other outbreaks of the highly contagious illness spread across dozens of other states.

With less than 5% of infected individuals in Texas vaccinated, health officials highlight the urgent need for increased measles immunization rates in communities.