Measles Cases and Outbreaks

CDC updates this page monthly.

Measles Cases in 2020

As of August 19, 2020, there have been 12 confirmed cases in 7 jurisdictions.*

*Jurisdictions refer to any of the 50 states, New York City, and the District of Columbia.

Measles Cases in 2019

  • From January 1 to December 31, 2019, 1,282* individual cases of measles were confirmed in 31 states. Of these cases, 128 were hospitalized and 61 reported having complications, including pneumonia and encephalitis.
  • This is the greatest number of cases reported in the U.S. since 1992. More than 73% of the cases were linked to recent outbreaks in New York. The majority of cases were among people who were not vaccinated against measles. Measles is more likely to spread and cause outbreaks in U.S. communities where groups of people are unvaccinated.
  • All measles cases were caused by measles wild-type D8 or B3.

Number of Measles Cases Reported by Year

2010-2019*(as of May 7, 2020)

*Reporting for 2019 began December 30, 2018. Case count is preliminary and subject to change.

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Make sure you are vaccinated against measles before traveling internationally.

Spread of Measles
  • The majority of people who got measles were unvaccinated.
  • Measles is still common in many parts of the world.
  • 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

In a given year, more measles cases can occur for any of the following reasons:

  • an increase in the number of travelers who get measles abroad and bring it into the U.S., and/or
  • further spread of measles in U.S. communities with pockets of unvaccinated people.

Reasons for an increase in cases some years:

Page last reviewed: August 19, 2020