The Pan American Health Organization withdrew the United States' measles-free status after a sharp rise in infections in recent years. The country had held the status since 2000.

More than 5,400 measles cases have been recorded in the United States this year, compared with 2,289 in 2025 and 285 in 2024. To regain the status, the United States must stop measles transmission for at least 12 months.