measles in the u.s. and measles in montana

Measles is caused by a virus in the body that spreads easily through the air and settles on surfaces. It is the single most contagious infection in human history. Most people are able to recover after about 10 days and usually do not cause long-term medical issues. However, measles can be deadly, especially for young children and individuals within weakened immune systems. Outbreaks of the virus are more common among the unvaccinated.

In Montana

According to Montana Department of Health and Human Services (DPHHS), there have been 23 confirmed cases of measles reported in Montana. All 23 cases of measles are Montana residents and have been reported from four counties in Montana: Flathead (2), Yellowstone (2), Hill (4), and Gallatin (15). More information can be found by visiting the county health department websites.

Keep up to date with Montana DPHHS for state measles news, education, and information at https://dphhs.mt.gov/publichealth/cdepi/diseases/measles

View and Download Measles Fact Sheet

In the U.S.

• There have been 23 outbreaks** reported in 2025, and 89% of confirmed cases (1,081 of 1,214) are outbreak-associated. For comparison, 16 outbreaks were reported during 2024 and 69% of cases (198 of 285) were outbreak-associated.
• U.S. MMR coverage among kindergarteners is now below the 95% coverage target—much lower in some communities—and is decreasing.
• 12% of cases hospitalized (146 of 1,214).
• There have been 3 confirmed deaths from measles.

Keep up to date with the latest numbers and what you need to know to prepare - link: Measles on the Rise: How to Prepare and Respond in Your Clinic | Infectious Diseases | CDC’s Project Firstline | AMA Ed Hub