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To date in 2025 measles outbreaks have been reported in multiple states, raising concerns about continued spread, increases in hospitalizations and deaths, and loss of measles elimination status, highlighting the importance of measles vaccination and rapid detection and reporting of suspected and confirmed measles cases. 

Measles is a highly contagious disease spread primarily through the air when an infected person coughs, sneezes, or talks, releasing tiny droplets containing the virus. People infected with measles have fever and a red, slightly raised rash. Some people with measles develop complications like ear infections, pneumonia, diarrhea, or inflammation of the brain itself, encephalitis, which can cause brain damage. Severe measles can lead to hospitalization and even death. The best way to prevent contracting measles is through measles vaccination. Having a high percentage of people fully vaccinated against measles is the best way to prevent outbreaks, and is also the best way to protect people who cannot get measles vaccines, such as babies or people with cancer.

The maps above show the current geographic distribution of confirmed measles cases in 2025 by county across the United States, with the largest outbreak seen in west Texas from which other outbreaks have spread. The cumulative cases map includes measles cases reported for each county in the United States since January 1, 2025, revealing the relative scale of the outbreaks across states. The recent cases map includes only those cases reported within the past two weeks, providing a near real-time view of active transmission or newly imported cases. Blue dots represent locally acquired cases while red dots represent imported cases from out of jurisdiction (out of state or out of country) travel. As indicated by the relative size of the blue dots, most of the reported cases are due to local transmission, with relatively few cases being imported. Of the imported cases, the vast majority occur in travelers returning from other countries with ongoing measles outbreaks.

In addition to the measles maps, the following table shows the cumulative number and recent measles case counts, and whether imported or locally acquired, for each county (and state) where confirmed measles cases were reported in 2025.

One of the striking features of the current measles outbreaks is the rate at which measles cases have been increasing. The rate at which measles cases have increased in 2025 is similar to the rate in 2019 when there was a global measles resurgence - and more measles cases in the United States than in any year in the past three decades.

The time series below shows the increase in measles cases over time in the United States by year since 2018. The cumulative time series shows the total number of measles cases reported to date in 2025 compared with previous years. The sharp upward slope of the curve in 2025 reflects the rapid spread of measles virus this year. The weekly cases chart displays the number of reported measles cases by month since 2019, highlighting the magnitude of the current outbreak relative to recent years. You can toggle between ‘Cumulative cases by year’ and ‘Weekly cases’ graphs.

Measles vaccination is the best way to prevent measles and stop outbreaks. We see this clearly by looking at the vaccination status of measles cases in the United States. Unvaccinated individuals or those with unknown vaccination status represent almost all reported measles cases. These outcomes are consistent with estimates that two doses of measles vaccine protects 97% of those vaccinated. 

Before the introduction of measles vaccine in the United States in 1963, measles was largely a disease of young children. But measles cases now occur across all age groups. After widespread use of measles vaccine, unvaccinated individuals are less likely to be exposed to measles virus when growing up because they are protected from encountering the virus by vaccinated people in their community. However, when measles outbreaks do occur, as now in the United States, these susceptible adolescents and adults can get measles. The chart below shows the distribution of measles cases by age group in the United States in 2025. Many cases are in school age children, but older adolescents are also getting measles.

This dashboard is updated Tuesdays and Fridays at or around 3:00 PM Eastern Time. The data presented in the maps are compiled from official sources, including state and county health departments and additional county-level news releases or news articles. The data represent all laboratory-confirmed measles cases reported by public health authorities in 2025. The data exclude "probable cases", cases not yet laboratory-confirmed, and cases not publicly reported. All reported cases are categorized as local unless indicated otherwise by the reporting source. Data completeness and timeliness vary by reporting jurisdiction. Recent case counts may be incomplete and are subject to backward revision as investigations are completed. To access the data and extended details on the data descriptions, data sourcing, data/image use and licensing, please refer to the project's .

About This Project

The project is a collaborative, interdisciplinary effort conducted by a group of researchers at who are tracking and modeling the risk of measles in the U.S. It reflects contributions from the at the Whiting School of Engineering, the International Vaccine Access Center (IVAC) at the Bloomberg School of Public Health, and .
 
The team is led by , Shaun Truelove, and William Moss. 

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