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Pan American Health Organization

Pan American Health Organization

International Health Agency

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America's measles elimination status at risk

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Issued Feb epidemiological alert on regional surge

The United States declared measles eliminated in 2000, after decades of vaccination campaigns against the most contagious virus known to infect humans. On January 22, 2026, that status entered jeopardy when the country passed one year and two days of continuous transmission, starting in West Texas.

Updated May 22