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Measles Cases and Outbreaks

Español: Casos y brotes de sarampión

Measles Cases

From January 1 to April 10, 2015, 159 people from 18 states and the District of Columbia were reported to have measles [AZ (7), CA (101), CO (1), DC (2), DE (1), GA (1), IL (15), MI (1), MN (1), NE (2), NJ (1), NY (3), NV (9), OK (1), PA (1), SD (2) TX (1), UT (2), WA (7)]†. Most of these cases [117 cases (74%)] are part of a large, multi-state outbreak linked to an amusement park in California.

2015 measles cases in the U.S., January 1 to April 10, 2015. Map of the U.S. indicates in shades of light to dark blue the number of cases. Twelve states (Colorado, Delaware, Georgia, Michigan, Minnesota, Nebraska, New Jersey, New York, Oklahoma, Pennsylvania, South Dakota, Texas, and Utah) and the District of Columbia have 1 to 4 cases. Three states (Arizona, Nevada and Washington) have 5 to 9 cases. One state (Illinois) has 10 to 19 cases and one state (California) has 20 or more cases. These are provisional data reported to CDC’s National Center for Immunization and Respiratory Diseases.

† CDC will update these data weekly on Mondays.

The United States experienced a record number of measles cases during 2014, with 668 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. January 1 to April 10, 2015. 159 cases reported in 18 states and District of Columbia: Arizona, California, Colorado, Delaware, Georgia, Illinois, Michigan, Minnesota, Nebraska, Nevada, New Jersey, New York, Oklahoma, Pennsylvania, South Dakota, Texas, Utah, and Washington. 4 outbreaks representing 91% of reported cases this year.

  • The majority of 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:

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

 

Publications

MMWR: 2015 Outbreaks

 

MMWR: 2014 Outbreaks

 

MMWR: 2013 Outbreaks

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