A sign outside Southwestern Public Health in St. Thomas, Ontario, Canada, on Tuesday, March 4, 2025, warns residents to call ahead before visiting a doctor or hospital if they think they have the measles. (Geoff Robins/The Canadian Press via AP)
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A dose of the measles, mumps, and rubella (MMR) vaccination awaits the next patient during a vaccine clinic at Southwestern Public Health in St. Thomas, Ontario, Canada, on Tuesday, March 4, 2025. (Geoff Robins/The Canadian Press via AP)