A sharp rise in largely preventable infections has put the United States’ 2000 measles elimination designation at risk ahead of a Pan American Health Organization review.
The United States could be on the verge of losing its measles elimination status as the virus continues to spread across the country, raising fresh alarm about falling vaccination coverage and the strain on public health systems. The issue is expected to come before the Pan American Health Organization next month, when officials will assess whether sustained transmission has returned.
According to data from the Centers for Disease Control and Prevention, the U.S. had recorded 4,080 confirmed measles cases by October 9, with 96% linked to outbreaks. That is already well above the 2,289 cases reported for all of 2025, underscoring how sharply the disease has rebounded after decades of relative control.
The national picture is uneven but worrying. A measles tracker maintained by Johns Hopkins Bloomberg School of Public Health counted 4,267 cases as of October 15, and Fast Company reported that Pennsylvania alone accounted for 1,136 cases. South Carolina and Utah followed, with 671 and 527 cases respectively, although almost every state has now reported at least one infection. The tracker also found that 97% of this year’s cases were among people who were unvaccinated or whose vaccination status was unknown.
Measles was declared eliminated in the United States in 2000, meaning the disease was no longer spreading continuously within the country. Public health experts now say that standard is in danger of being reversed. Amria Roess, a professor of global health and epidemiology at George Mason University and a former CDC officer, said in a university briefing that the country’s likely loss of elimination status would reflect broader weakening in public health. She said the country now has “so many unvaccinated individuals” that local transmission is becoming widespread.
The Pan American Health Organization, which oversees public health in the Americas, had originally set an April meeting to review the elimination status of the United States and Mexico, but rescheduled it for November 10 to 13. In an October 14 statement, the organisation said the review would examine the “re-establishment of endemic measles transmission”, which it defines as uninterrupted spread of the same viral lineage for 12 months or more. U.S. health officials said the delay would allow more time to analyse outbreak data, while also insisting that the MMR vaccine remains the best protection against measles.
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