As of December 31, 2024, a total of 285 measles cases were reported by 33 jurisdictions*:
| State | Cases | State | Cases |
| Arizona | 1-9 | New York City | 10-19 |
| California | 10-19 | New York State | 1-9 |
| District of Columbia | 1-9 | North Carolina | 1-9 |
| Florida | 10-19 | Ohio | 1-9 |
| Georgia | 1-9 | Oklahoma | 1-9 |
| Idaho | 1-9 | Oregon | 20-49 |
| Illinois | 50-99 | Pennsylvania | 1-9 |
| Indiana | 1-9 | South Carolina | 1-9 |
| Louisiana | 1-9 | South Dakota | 1-9 |
| Maryland | 1-9 | Tennessee | 1-9 |
| Massachusetts | 1-9 | Texas | 1-9 |
| Michigan | 1-9 | Vermont | 1-9 |
| Minnesota | 50-99 | Virginia | 1-9 |
| Missouri | 1-9 | Washington | 1-9 |
| New Hampshire | 1-9 | Wisconsin | 1-9 |
| New Jersey | 1-9 | West Virginia | 1-9 |
| New Mexico | 1-9 |
*Jurisdictions refer to any of the 50 states, New York City, and the District of Columbia. Data is updated weekly on Fridays.
Data source: CDC Measles Cases and Outbreaks
Total Cases: 285
| Under 5 Years Old | 120 (42%) |
| 5 - 19 Years Old | 88 (31%) |
| 20+ Years Old | 77 (27%) |
| Unvaccinated or Unknown Vaccination Status | 89% |
| One MMR Dose | 7% |
| Two MMR Doses | 4% |
40% of measles cases were hospitalized (114 of 285) for isolation or for management of measles complications.
| Under 5 Years Old | 52% (62 of 120) |
| 5 - 19 Years Old | 25% (22 of 88) |
| 20+ Years Old | 39% (30 of 77) |
There have been 16 outbreaks (defined as 3 or more related cases) reported in 2024, and 69% of cases (198 of 285) are outbreak-associated. For comparison, 4 outbreaks were reported during 2023 and 49% of cases (29 of 59) were outbreak-associated.
| Year | Total Number of Cases | Number of Jurisdictions |
|---|---|---|
| 2024 | 285 | 33 |
| 2023 | 58 | 20 |
| 2022 | 121 | 6 |
| 2021 |
49 |
5 |
| 2020 | 13 | 8 |
| 2019* | 1,274 |
31 |
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.
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.
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.
