From Jan. 1 to Jan. 30, 2015, 102 people from 14 states were reported to have measles. Most of these cases are part of a large, ongoing multi-state outbreak linked to an amusement park in California. On Jan. 23, 2015, the Centers for Disease Control and Prevention (CDC) issued a health advisory to notify public health departments and healthcare facilities about this multi-state outbreak and to provide guidance for healthcare providers nationwide.
The U.S. experienced a record number of measles cases during 2014, with 644 cases from 27 states reported to CDC's National Center for Immunization and Respiratory Diseases (NCIRD). This is the greatest number of cases since measles elimination was documented in the U.S. in 2000.