Via the CDC: Measles: Cases and Outbreaks. The current tally is 288 cases and 15 outbreaks so far this year—by far the highest numbers this century. Click through for the full report and many links. Excerpt:
From January 1 to May 23, 2014, 288 measles cases have been reported in the United States to CDC’s National Center for Immunization and Respiratory Diseases (NCIRD). Since measles elimination was documented in the U.S. in 2000, annual reported cases have ranged from a low of 37 in 2004 to a high of 220 in 2011.
• The majority of the people who got measles are unvaccinated.
• Measles is still common in many parts of the world including some countries in Europe, Asia, the Pacific, and Africa, travelers with measles continue to bring the disease into the U.S.
• Measles can spread when it reaches a community in the U.S. where groups of people are unvaccinated.
Outbreaks in countries to which Americans often travel can directly contribute to an increase in measles cases in the U.S.
Reasons for an increase in cases some years:
• 2014: The Philippines is experiencing a large, ongoing measles outbreak (more than 26,000 cases were reported as of April 20). Many of the cases in the U.S. in 2014 have been associated with cases brought in from the Philippines. For more information see the Measles in the Philippines Travelers’ Health Notice.
• 2013: The U.S. experienced 11 outbreaks in 2013, three of which had more than 20 cases, including the largest U.S. outbreak reported since measles was eliminated in 2000. For more information see Measles—United States, January 1–August 24, 2013.
• 2011: In 2011, more than 30 countries in the WHO European Region reported an increase in measles, and France was experiencing a large outbreak. Most of the cases that were brought to the U.S. in 2011 came from France. For more information see Measles—United States, January–May 20, 2011.
• 2008: The increase in cases in 2008 was the result of spread in communities with groups of unvaccinated people. The U.S. experienced several outbreaks in 2008 including three large outbreaks. For more information see Update: Measles—United States, January–July 2008.