The U.S. is experiencing its worst resurgence of measles in more than three decades, and is at risk of losing its measles elimination status.

The U.S. reported 144 new measles cases in the past week, according to the Yale School of Public Health.

A team at the Yale School of Public Health has been closely tracking cases in the Americas since early 2025, issuing weekly reports of new cases via its virtual medical operation centers (VMOC) special report. [MEDPAGE TODAY]

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in 2026, the Pan American Health Organization (PAHO) will assess the situation in the U.S., and if their analyses show that measles has spread continuously for a year, the country will likely lose its measles-free status. PAHO revoked Canada's measles elimination status in 2025.

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