The United States has recorded 1,001 measles cases so far this year.
Reuters reports that the worst outbreak of the highly contagious disease in more than a quarter-century.
Federal health officials pleaded for parents to vaccinate their children.
It is the highest number of cases since 1992, when the CDC recorded 2,126 cases.
Federal health officials attribute this year’s outbreak to U.S. parents who refuse to vaccinate their children.