Measles Update: May 13th
Once declared eliminated in the United States, measles is making a dramatic comeback
Key Facts:
As of May 9th, 1,001 confirmed measles cases have been reported across 31 U.S. jurisdictions in 2025, more than triple the total number of cases reported in all of 2024.
Outbreak-driven surge: 93% of 2025 cases are associated with 14 outbreaks, compared to 69% outbreak-associated cases across 16 outbreaks in 2024.
Most patients are unvaccinated: 96% of all confirmed cases are either unvaccinated or have unknown vaccination status; young children under age 5 account for nearly a quarter of all hospitalizations.
Top new cases reported as of this reporting period
Texas (+26)*
North Dakota (+9)
New Mexico (+4)
Kensas (+2)
Illinois (+2)
*Measles cases in Texas declined by approximately 29.7% compared to the previous week.
Most Impacted age group
The most impacted age group by total cases: 5–19 years (38% of all cases)
Highest hospitalization risk: Children under 5 years (23% hospitalized)
Vaccination Coverage
Vaccination status of cases: 96% were unvaccinated or unknown vaccination status
One MMR dose: 2%
Two MMR doses: 2%
Table Summarizing Measles (MMR) Vaccination Guidance:
