US measles cases hit 4,852 as PAHO weighs ending 25-year elimination status

The United States is weeks away from losing the measles elimination status it has held since 2000, and the decision will not be made in Washington.

The CDC confirmed on October 30 that 4,852 Americans had tested positive for measles as of October 29 — more than double the 2,289 cases recorded in all of 2025, with two months still left in the year. The agency logged 264 new cases in the past seven days, the 12th straight week of triple-digit increases, and the highest yearly total in 35 years.

The geographic concentration is sharp. Pennsylvania logged 88 new cases in the most recent week, followed closely by Wisconsin. The CDC has recorded 43 outbreaks nationwide so far this year, compared with 48 for all of last year.

Elimination status is not a case-count trophy. It is a formal designation that a country has interrupted sustained local transmission of a vaccine-preventable disease. The U.S. first achieved it in 2000. Losing it would reverse a 25-year public health achievement and signal to the world that measles is spreading continuously within American borders.

The final call rests with the Pan American Health Organization's Regional Monitoring and Re-Verification Commission, an independent technical body. PAHO invited the United States and Mexico to a virtual review on April 13, 2026, then postponed the elimination review from April to November 2026. Public health officials have described a determination against the U.S. as a near-certainty. PAHO has not yet issued it.