Texas Measles Outbreak Fades While Ontario Rages

During 2025, various measles outbreaks have been reported in North America. As of the end of May, the data from Canada and the United States have diverged.

In Canada, during week #20 (May 11 to 17, 2025), 354 new measles cases were reported. 

Throughout 2025, a total of 2,515 measles cases have been reported by nine Canadian jurisdictions: Alberta, British Columbia, Manitoba, the Northwest Territories, Nova Scotia, Ontario, Prince Edward Island, Quebec, and Saskatchewan. 

With Ontario reporting 1,848 cases, the vast majority of Canada's measles outbreak.

In the U.S., the Centers for Disease Control and Prevention (CDC) reported a total of 1,046 confirmed measles cases as of May 22, 2025, across 31 jurisdictions.

Of all states, Texas has been the unfortunate leader in 2025.

The Texas Department of State Health Services has reported 729 cases in West Texas and 24 other cases since late January 2025. The good news is that Texas has only reported one new measles case since May 23.

Globally, Ontario and Texas are not the only areas with measles outbreaks in 2025.

To notify international travelers of this ongoing health risk, the CDC reissued a Travel Health Advisory on May 28, 2025, identifying more than 50 countries that have reported measles cases.

The CDC recommends that international travelers be fully vaccinated against measles with the measles-mumps-rubella (MMR) vaccine, according to the CDC's measles vaccination recommendations for international travel. 

However, the CDC says, 'travelers unable to safely receive a measles-containing vaccine should talk to their clinician and consider postponing their trip.'

In the U.S., travel vaccine experts are staffed within many clinics and pharmacies to offer local vaccination recommendations.