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Measles Outbreak Expands Across North America, Cases Surpass 1,600

Public health officials urge vaccinations as U.S. cases exceed 700 and Ontario reports over 900 infections, with underreporting and vaccine hesitancy worsening the crisis.

A sign outside Southwestern Public Health in St. Thomas, Ont. on Tuesday, March 4, 2025 warns residents to call ahead before visiting a doctor or hospital if they think they have the measles. THE CANADIAN PRESS/ Geoff Robins
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A view shows MMR vaccine at the City of Lubbock Health Department in Lubbock, Texas, U.S. February 27, 2025. REUTERS/Annie Rice/File Photo
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Overview

  • Texas remains the epicenter of the U.S. outbreak with 561 confirmed cases, including two deaths, and the CDC warns the true case count is likely higher due to underreporting.
  • Ontario’s outbreak has reached 925 cases since October, with 109 new infections and eight additional hospitalizations reported in the last week alone.
  • Michigan confirms its first measles outbreak since 2019, with seven cases, including three in Montcalm County, where nearly 25% of young children remain unvaccinated.
  • The CDC reports over 700 measles cases across 24 U.S. states, the highest count since 2019, and has deployed additional resources to affected areas.
  • Health officials in both the U.S. and Canada are urging communities to update MMR vaccinations, especially ahead of holiday gatherings, to curb further spread.