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Measles Cases and Outbreaks

Español: Casos y brotes de sarampión

Measles Cases

This year the United States is experiencing a record number of measles cases. From January 1 to November 29, 2014, there have been 610 confirmed measles cases reported to CDC's National Center for Immunization and Respiratory Diseases (NCIRD). This is the highest number of cases since measles elimination was documented in the U.S. in 2000.

Measles cases and outbreaks from January 1-November 29, 2014. 610 cases reported in 24 states: Alabama, California, Connecticut, Hawaii, Illinois, Indiana, Kansas, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Jersey, New Mexico, New York, Ohio, Oregon, Pennsylvania, Tennessee, Texas, Utah, Virginia, Wisconsin, and Washington. 20outbreaks representing 89% of reported cases this year. 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.

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Measles Outbreaks

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. 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 an outbreak with 58 cases. 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.

See also: The Surveillance Manual chapter on measles that describes case investigation, outbreak investigation, and outbreak control for additional information.

 

MMWR: 2014 Outbreaks

 

MMWR: 2013 Outbreaks

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