The United States has lost its measles elimination status, 26 years after first earning the designation in 2000. The Pan American Health Organization, the regional arm of the World Health Organization for the Americas, made the determination after reviewing evidence that the virus had spread continuously within the country for more than 12 months, the threshold the organization uses to define elimination.
Elimination never meant measles cases stopped entirely. Since 2000, the US has recorded sporadic outbreaks almost every year, typically traced to travelers bringing the virus in from abroad and sparking clusters of local spread that public health officials were able to contain within months. What changed this time is that an outbreak that began in January 2025 never fully stopped. Confirmed cases climbed from about 2,289 in 2025 to more than 5,400 so far in 2026, more than double the prior year's total, with health officials attributing the spread to gaps in vaccination coverage in several states.
The toll has included ten measles-associated deaths in the US this year, after Pennsylvania and Wisconsin each reported an additional death on Friday. Public health specialists describe the loss of elimination status as significant largely as a marker of how prepared the broader health system is to catch and contain infectious disease, rather than as a sign that measles itself has become dramatically more dangerous day to day.
The United States is not alone in facing this reassessment. The United Kingdom, Canada and Spain have each lost elimination status in recent years following their own prolonged outbreaks. To regain the designation, PAHO requires a country to demonstrate a full year without continuous domestic transmission, a process health officials say will take sustained effort on vaccination outreach.
Watch state health departments in areas with ongoing clusters for updates on vaccination campaigns, and watch for the next PAHO review, which will determine whether the US is making progress toward regaining elimination status.
What does losing 'elimination status' actually mean?
It means health authorities determined the virus has been spreading continuously within the country for more than a year, rather than only arriving through occasional travel-linked cases.
How many people have died from measles in the US this year?
Ten measles-associated deaths have been reported in 2026, including two announced Friday in Pennsylvania and Wisconsin.