America defeated measles in 2000. Vaccine opposition brought it roaring back. NBC NewsCDC chief says agency will not change measles response if US loses elimination status CNNThe U.S. could lose a decades-old public health achievement The Washington PostThe U.S. Has Lost Its Measles-Elimination Status, Data Suggests The New York TimesMeasles Forges a Deadly Trail Across America, Exposing Fractured Health System Bloomberg.com