Measles Cases and Outbreaks

Measles Cases

From January 1 to January 28, 2015, 84 people from 14 states were reported to have measles*. Most of these cases are part of a large, ongoing outbreak linked to an amusement park in California . On January 23, 2015, 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. For more information see CDC Press Briefing Transcript: Measles in the United States, 2015, January 29, 2015.

* CDC will update this data weekly on Mondays.

The United States 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.

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 were 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:

2015: The majority of cases reported so far during 2015 are part of a large, ongoing outbreak linked to an amusement park in California .
2014: The U.S. experienced 23 measles outbreaks in 2014, including one large outbreak of 383 cases, occurring primarily among unvaccinated Amish communities in Ohio. Many of the cases in the U.S. in 2014 were associated with cases brought in from the Philippines, which experienced a large measles outbreak. 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.

MMWR: 2014 Outbreaks

Measles Outbreak in an Unvaccinated Family and a Possibly Associated International Traveler — Orange County, Florida, December 2012-January 2013
MMWR. Sep 12, 2014
Four children in a Florida family were diagnosed with measles in January 2013. None of the four were vaccinated against measles, and none had traveled outside of Orange County, Florida, during the periods when they likely had been exposed...
Notes from the Field: Measles in a Micronesian Community — King County, Washington, 2014
MMWR. Sep 12, 2014
This outbreak demonstrates the ease with which measles can be imported from a country with an ongoing outbreak and spread among a local population...
Measles — United States, January 1-May 23, 2014
MMWR May 29, 2014
From January 1 through May 23, 2014, a total of 288 confirmed measles cases have been reported to CDC, surpassing the highest reported yearly total of measles cases since elimination.
Notes from the Field: Measles — California, January 1-April 18, 2014
MMWR. Apr 25, 2014
During January 1-April 18, 2014, 58 confirmed measles cases were reported in California, the highest number reported for that period since 1995.