U.S. Formally Loses Measles Elimination Status After Sustained Outbreaks
Measles is once again considered an actively spreading disease in the United States, after regional health authorities quietly concluded this week that the country no longer meets the definition of having eliminated the virus.[1] The decision by the Pan American Health Organization (PAHO), confirmed by researchers involved in the review, comes amid more than 5,400 confirmed U.S. cases so far this year and 13 reported measles-related deaths.[2]
PAHO reached its determination during the week of November 9-14, based on two formal assessments, one by the Centers for Disease Control and Prevention and another by an independent panel of measles experts, with a public announcement planned for November 17.[1] Johns Hopkins University researchers estimate that recent U.S. outbreaks have sickened more than 8,000 people, led to over 830 hospitalizations, and cost roughly $125 million in medical care, public health response, and lost productivity.[1] The Utah outbreak that pushed past 12 months of continuous spread in June was a key trigger for the loss of status, crossing the threshold that distinguishes imported flare-ups from reestablished local transmission.[1]
The United States first earned measles-free certification in 2000, after officials documented that no chain of local transmission had lasted 12 months or longer, even as travelers repeatedly brought the virus into the country. That status held through high-profile outbreaks such as the 2015 Disneyland cluster and the 2018-19 surge in New York's Orthodox Jewish communities, which were large but ultimately extinguished in under a year. The current wave began shortly after the 2025 inauguration, with a West Texas outbreak that, within seven months, became the largest since 1992 and spread into Mexico and at least three other states.[1] CDC data show the U.S. went from 285 cases in 2024 to 2,289 in 2025, and to 5,412 cases across 47 jurisdictions as of November 12, 2026, fueled by 43 distinct outbreaks, most tied to under-vaccinated communities.[2]
The regional picture set the stage for this reversal. In November 2025, PAHO ruled that Canada had also lost measles elimination status after an outbreak that began in New Brunswick in October 2024 ran longer than a year, causing the entire Region of the Americas to forfeit its measles-free designation. That followed earlier lapses driven by prolonged outbreaks in Venezuela in 2018 and Brazil in 2019, before the region regained verification in 2024. A country can only win the label back after 12 consecutive months with transmission interrupted, meaning the United States now faces at least a yearlong climb to restore what it first achieved a quarter-century ago.[1]
Officials and experts are clashing over how much blame belongs to current leaders versus longer-running erosion in vaccine coverage. HHS spokesperson Emily Hilliard attributed the resurgence to "vaccination gaps that opened before the current administration," while scientists quoted by NPR and KFF Health News pointed to budget cuts to state immunization programs and the termination of federal funding for vaccine hesitancy research during the Trump administration.[1] Former CDC director Susan Monarez, who was fired in August 2025, has testified that she was pressured to preapprove changes to vaccine recommendations without reviewing supporting evidence and warned Congress that weakening protections would bring back preventable diseases in the middle of the largest measles outbreak in 30 years.[1] CDC school-coverage data back up concerns about shrinking immunity: in the 2025-26 school year, 92.4% of U.S. kindergartners had documentation of measles, mumps and rubella (MMR) vaccination, leaving roughly 280,000 without a completed series and exemptions rising to 4.2%, with 24 states above 5%.[3]
Political reaction has been swift and sharply divided. Sen. Bernie Sanders, the Vermont independent who serves as ranking member on the Senate health committee, blasted HHS Secretary Robert F. Kennedy Jr. on social media, saying that after 26 years the country had "officially lost its status as a country that stopped the spread of measles" and calling 5,400 infections and 10 deaths this year "shameful." At the same time, data-focused commentators such as the writer known as Crémieux argue the resurgence reflects a broader, pre-existing decline in vaccine confidence across wealthy countries, noting that the situation is "worse in the U.K. and Canada" and that the U.S. appeared poised for trouble even before COVID-19 lockdowns temporarily suppressed transmission. Analysts say that tension between administration-specific decisions and a longer global anti-vaccine tide will shape how quickly the U.S. can rebuild public trust, close immunity gaps, and reclaim its measles-free status.
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📊 Relevant Data
As of November 12, 2026, CDC counted 5,412 confirmed U.S. measles cases in 2026 across 47 jurisdictions, from 43 new outbreaks. 96% of cases (5,216) were outbreak-associated: 3,831 from outbreaks that began in 2026 and 1,385 from outbreaks that began in 2025. The 2025 full-year total was 2,289 confirmed cases from 48 outbreaks, and 2024 had 285 cases from 16 outbreaks.
Measles Cases and Outbreaks — Centers for Disease Control and Prevention
In the 2025-26 school year, MMR coverage among U.S. kindergartners was 92.4% (down from 92.5%), leaving about 280,000 kindergartners without documentation of a completed MMR series. Exemptions from one or more vaccines rose to 4.2% from 3.6%, about 155,000 children, increasing in 41 states and D.C., with 24 states above 5%.
Vaccination Coverage and Exemptions among Kindergartners (SchoolVaxView) — Centers for Disease Control and Prevention
📌 Key Facts
- Researchers involved in the review say the Pan American Health Organization decided during the week of November 9–14, 2026, that measles has reestablished regular transmission in the U.S., with a public announcement planned for November 17, 2026.
- PAHO based its determination that the U.S. has lost measles elimination status on two formal assessments, one conducted by the CDC and another by an independent group of measles experts.
- The Utah measles outbreak surpassed the 12‑month duration threshold in June 2026, becoming a key trigger for the loss of U.S. measles elimination status.
- Johns Hopkins University researchers estimate that recent U.S. measles outbreaks have sickened more than 8,000 people, led to over 830 hospitalizations, and cost roughly $125 million in medical care, public health response, and productivity losses.
- States have reported 13 measles-associated deaths in the current resurgence, including a 7‑month‑old in New York and infants in Pennsylvania and Wisconsin.
- An HHS spokesperson, Emily Hilliard, attributed the measles resurgence to vaccination gaps that opened before the current administration, while the article notes earlier budget cuts to state immunization programs and the termination of vaccine hesitancy research funding under the Trump administration.
- Former CDC director Susan Monarez, fired in August 2025, previously testified to Congress that she was pressured to preapprove changes to vaccine recommendations without reviewing evidence and warned that weakening vaccine protections would bring back preventable diseases amid the largest measles outbreak in 30 years.
- HHS spokesperson Emily Hilliard blamed vaccination gaps that opened years before the current administration. The cuts to state immunization programs and the ended vaccine-hesitancy research funding were cited by scientists *criticizing* the Trump administration; they were not part of the HHS explanation, as the story's wording suggests. The White House (spokesperson Allison Schuster) defended the administration's record. (NPR / KFF Health News)
- CDC now counts 2,289 confirmed U.S. measles cases for the full year 2025 (other reports cite an earlier tally of 2,242) and 5,412 for 2026 as of November 12. (Centers for Disease Control and Prevention)
📰 Source Timeline (2)
Follow how coverage of this story developed over time
- Researchers involved in the review say PAHO decided in the week of November 9–14, 2026, that measles has reestablished regular transmission in the U.S., with a public announcement planned for November 17, 2026.
- PAHO based its determination on two formal assessments: one conducted by the CDC and another by an independent group of measles experts.
- The Utah measles outbreak surpassed the 12‑month duration threshold in June 2026, becoming a key trigger for the loss of elimination status.
- Johns Hopkins University researchers now estimate that more than 8,000 people have been sickened in recent U.S. outbreaks, over 830 have been hospitalized, and the outbreaks have cost roughly $125 million in medical care, public health response, and productivity losses.
- States have reported 13 measles-associated deaths in the current resurgence, including a 7‑month‑old in New York and infants in Pennsylvania and Wisconsin.
- An HHS spokesperson, Emily Hilliard, attributed the resurgence to vaccination gaps that opened before the current administration, while the article details budget cuts to state immunization programs and the termination of vaccine hesitancy research funding under the Trump administration.
- Former CDC director Susan Monarez previously testified to Congress after her August 2025 firing that she was pushed to preapprove changes to vaccine recommendations without reviewing evidence and warned that weakening vaccine protections would bring back preventable diseases amid the largest measles outbreak in 30 years.