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A health worker prepares a dose of the measles vaccine in shopping mall in Ciudad Juarez, Chihuahua state, Mexico, Wednesday, April 30, 2025. (AP Photo/Christian Chavez)

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A health worker stamps a vaccination card at the health center where measles vaccinations are given in Ciudad Juarez, Chihuahua state, Mexico, Wednesday, April 30, 2025. (AP Photo/Christian Chavez)

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A health worker gives a child a measles vaccine at the health center in Ciudad Juarez, Chihuahua state, Mexico, Wednesday, April 30, 2025. (AP Photo/Christian Chavez)

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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)

North America’s three biggest measles outbreaks have grown to a total of more than 2,500 known cases. Three people have died in the U.S. and one in Mexico. Mexican and U.S. officials say the strains of measles spreading in Canada match the other large outbreaks. One official says the “virus was imported, traveling country to country.” Cities on the borders, like El Paso, Texas, and Ciudad Juarez, Mexico, are informally working together to stop the spread. A recent World Health Organization report said measles activity in the Americas region is 11 times as much as the same timeframe last year and that the risk level is “high” compared to the rest of the world’s “moderate” level.

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Health and Human Services Secretary Robert F. Kennedy Jr., left, stands with Dr. Ben Edwards, right, outside the Reinlander Mennonite Church in Seminole, Texas, on Sunday, April 6, 2025, after a second measles death. (AP Photo/Annie Rice, File)

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This image from video posted on the Children's Health Defense website on March 31, 2025, shows Dr. Ben Edwards with a measles rash on his face, while working in a makeshift clinic in Seminole, Texas. (AP Photo)

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FILE - Health and Human Services Secretary Robert F. Kennedy Jr., right, stands with Dr. Ben Edwards, left, outside the Reinlander Mennonite Church in Seminole, Texas, on Sunday, April 6, 2025, after a second measles death. (AP Photo/Annie Rice, File)