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Public Health

Vetted resources and information on current public health events.

CDC Reported Measles Cases & Outbreaks

U.S. Measles Outbreak 2024
Data source: CDC Measles Cases and Outbreaks

As of April 4, 2024, a total of 113 measles cases were reported by 18 jurisdictions*:

State Confirmed Cases State Confirmed Cases
Arizona 3 California 6
Florida 11 Georgia 1
Illinois 57 Indiana 1
Louisiana 2 Maryland 1
Michigan 4 Minnesota 3
Missouri 1 New Jersey 1
New York City 2 New York State 1
Ohio 4 Pennsylvania 9
Virginia 1 Washington 7

*Jurisdictions refer to any of the 50 states, New York City, and the District of Columbia. Data is updated weekly on Fridays..

U.S. Measles Outbreaks in 2024

There have been 7 outbreaks (defined as 3 or more related cases) reported in 2024, and 73% of cases (83 of 113) are outbreak-associated. For comparison, 4 outbreaks were reported during 2023 and 48% of cases (28 of 58) were outbreak-associated. 

  • Philadelphia PA (January)
  • Seattle WA (January)
  • Broward Co FL (February)
  • Bay Area CA (February)
  • Montgomery Co OH (February)
  • Twin Cities MN (February)
  • Chicago IL (March - Ongoing)

For more information on the ongoing outbreak in Chicago, Illinois see the Chicago Department of Public Health Measles Update

U.S. Jurisdictions Reporting Measles Cases in 2024
As of April 4, 2024

Number of U.S. Measles Cases Reported by Week (2023-2024)
As of April 4, 2024

Note: rash onset date is currently unknown for two reported cases in 2024.

Measles Outbreak 2024 News & Updates

Nationwide Measles Outbreak 2024: News & Updates
  • April 9 -- A 4 year old from Detroit has a confirmed case of the measles, and potentially exposed others while seeking treatment for the highly infectious virus at DMC Children's Hospital of Michigan, an urgent care center and a pharmacy in the city, the Detroit Health Department announced
  • April 5 -- Will County (IL) health officials report positive measles case at ER in Joliet hospital, the second one in the county
  • April 1 -- Officials with the County of San Diego have confirmed a second case of measles in 2024 in a 47-year old resident who recently traveled overseas and has been hospitalized.
  • March 25 -- The New York State Department of Health is investigating a confirmed case of measles -- a highly contagious, viral respiratory disease that prompted a CDC warning last week -- on Long Island, Nassau County health officials said.
  • March 25 -- Florida reported another measles case on Friday, bringing the state’s total to 11 cases this year. The case was identified in South Florida’s Martin County, in an individual age 55-59. It was linked to travel outside of the country, according to data from the state health department’s web-based reportable disease surveillance system.
  • March 23 -- A measles case has been identified in a third Montgomery County (OH) resident and some people in Greene County may have been exposed.
  • March 22 -- Measles cases that turned up in at least three states this year were linked to visits to Florida, federal and state investigators concluded, including Ohio, Indiana and Louisiana.

Chicago Measles Outbreak 2024

Chicago Migrant Center Measles Outbreak: March 2024

On March 8 2024, the Chicago Department of Public Health (CDPH) identified its first case of measles since 2019. The case was identified in a resident at a new arrivals shelter in Pilsen and the City of Chicago is responding with a host of resources in order to protect residents at the shelter. The case of measles was identified in a young unvaccinated child.

Current Data & Resources
Chicago Measles Dashboard*

The Chicago Measles Dashboard provides up to date information on measles cases in the city of Chicago, including information related to ages as well as school and community exposure locations.

*Dashboard is updated daily at 8am.Case counts include Chicago residents diagnosed with measles in 2024, and non-Chicago residents associated with the Chicago-based measles outbreak. All data are provisional and subject to change. Information is updated as additional details are received. The data shown reflect what is known to the Chicago Department of Public Health (CDPH) at the time when the numbers are updated.

Historical Measles Cases & Outbreaks

Number of measles cases reported by year
2010-2023* (as of February 15, 2024)

*Case count is preliminary and subject to change.

U.S. Historical Measles Cases and Outbreaks
Year Total Number of Cases Number of Jurisdictions
2023 58 20
2022 121 6


2020 13 8
2019* 1,274


2019 Global Measles Outbreak

The 2019 measles outbreak refer to a substantial global increase in the number of measles cases reported, relative to 2018. As of April 2019, the number of measles cases reported worldwide represented a 300% increase from the number of cases seen in the previous year, constituting over 110,000 measles cases reported in the first three months of 2019. In the first half of 2019, the World Health Organization received reports of 364,808 measles cases from 182 countries, up 182% from the same time period of 2018 when 129,239 confirmed cases were reported by 181 countries.

U.S. Outbreak

In the United States, the number of measles cases was set to reach a 25-year high by the middle of the year, beginning with a large concentration of cases in the Pacific Northwest followed by another in New York, as well in the state of California with two quarantines ordered at two colleges in Los Angeles on April 28, 2019.


NYC Outbreak

The 2019 New York City measles outbreak was a substantial increase in the number of measles cases reported in the state of New York, primarily in New York City and neighboring Rockland County, New York in 2019, relative to the previous year.

New York City mayor Bill de Blasio declared a public health emergency on April 9, 2019. At that point, 285 cases of measles had been reported in Brooklyn and Queens since the October 2018. By the beginning of May 2019, 423 confirmed cases of measles had been reported in New York City.

On September 3, 2019, the New York City Health Department declared the outbreak to be over, due to the passage of a sufficient period of time with no new cases being reported in the city. NYC Health reported 649 total cases, with 473 cases in Williamsburg and 121 cases in Borough Park. Approximately 33,805 doses of the MMR vaccine were administered to people younger than 19 years old in Williamsburg and Borough Park.