PAHO experts rule US no longer measles-free, sources say; KFF reports the CDC’s own analysis fed the verdict

Full analysis

What happened Why it matters How each country tells it Where accounts conflict Room for disagreement Our assessment Sources and evidence

What happened

The United States no longer meets the measles elimination standard it has held since 2000, according to accounts that surfaced on November 14 and 15. So far the ruling exists only in the words of people who would not give their names.

A source close to the process told CNN on Friday that an independent commission of experts reporting to the director of the Pan American Health Organization had determined the US no longer qualified. CNN credited the first report to The Wall Street Journal, which cited sources familiar with the matter. KFF Health News separately cited researchers with direct knowledge of the deliberations. They said PAHO, which oversees health in the Americas and works with the World Health Organization, reached its conclusion this week: measles has reestablished regular transmission. According to KFF, PAHO had planned to announce the finding on November 17. None of the four article texts available quotes PAHO or the commission.

The test is technical. As CNN explains it, the commission treats measles as endemic when infections from the same strain pass from person to person for at least a year inside one country. Its members compare viral genomes from patients to rebuild the chains of transmission. Elimination still allows outbreaks, KFF notes, but they must end within a year.

Utah broke that rule. In August, scientists at Utah’s public health laboratory published a preprint, cited by CNN. It found that one strain had circulated in the state for more than a year and accounted for more than 95 percent of cases there. That strain moved from southwest to central Utah and caused more than 600 cases between June 2025 and June 2026. KFF reports that researchers expected the ruling once the outbreak passed the one-year mark in June. A University of Saskatchewan virologist who edits the journal Vaccine told CNN that the Utah data alone would have settled the case.

The surrounding picture is the worst in a generation. CNN, citing CDC data, puts this year’s cases above 5,400, the most since 1991. Most are tied to 43 new outbreaks this year, and more than 1,000 to outbreaks that began last year. CBS News, as relayed by IBTimes UK, counts 5,412 confirmed cases this year, 96 percent in people who were unvaccinated or whose status was unknown. By KFF’s figures, more than 830 people have been hospitalized over two years, and states have reported 13 measles-associated deaths, including a 7-month-old in New York. Johns Hopkins researchers estimate the outbreaks have cost roughly $125 million.

The resurgence began with West Texas in early 2025. Within seven months it was the largest US outbreak since 1992, KFF reports. It spread to Mexico and at least three other states, sickened more than 4,500 people across the two countries and killed at least 16.

KFF spends most of its length on the federal response. It contrasts that response with 2015 and 2019, when Congress held hearings and the CDC’s Morbidity and Mortality Weekly Report published outbreak analyses within weeks. This time, KFF reports, Congress held no hearing. HHS sent no funds until the West Texas emergency had subsided. Apart from an annual update, MMWR ran no outbreak reports in 2025, and it has still not published detailed accounts of the South Carolina, Utah and Pennsylvania outbreaks. White House spokesperson Allison Schuster wrote that "the President and the Secretary have repeatedly encouraged measles vaccination, coordinated with states, and facilitated the deployment of vaccine doses across the country." HHS spokesperson Emily Hilliard said HHS and the CDC had provided about $100 million in extra outbreak funding.

Why it matters

The loss is regional before it is national. Canada lost its status in November 2025. CNN notes that this also ended the measles-free designation PAHO and the WHO had given all 35 countries of the Americas in 2016, and that Mexico is in danger of following. The West Texas outbreak already crossed into Mexico. Yet this set contains no outlet from Mexico or Latin America and no voice from PAHO, and its Canadian piece is CNN copy under CP24’s masthead. The perspective of the countries most exposed is missing from the record available here.

Inside the US, the people at risk are those vaccines cannot protect: infants under a year and patients with cancer or transplants. Dr. William Moss of Johns Hopkins told CNN that measles can also erase immune memory of earlier infections. Getting the status back is slow by design. Paul Rota, a former CDC official, told KFF that current outbreaks must end and future ones must then be stopped within a year. With outbreaks expanding, he said, "Bigger fires create more embers, and any one of those embers can seed another fire."

How each country tells it

• 🇺🇸
  Texas Public Radio · United States · wire copy

  Runs KFF Health News’s full account: researchers with knowledge of the deliberations say PAHO concluded this week that measles transmission is reestablished, with a public announcement planned for November 17, and the piece spends most of its length on how the federal response to West Texas, Utah and other outbreaks differed from 2015 and 2019.
• 🇨🇦
  CP24 · Canada · wire copy

  Reports that an independent commission of experts reporting to PAHO’s director ruled the US no longer qualifies, citing one source close to the process who spoke to CNN and crediting The Wall Street Journal with the first report, then explains how genomic sequencing of the Utah strain settles such a ruling.
• 🇬🇧
  International Business Times UK · United Kingdom · carries KFF Health News

  Pairs the loss of status with anonymous CDC officials’ allegations that political appointees held back measles reports, and carries HHS’s on-record denial.
• 🇹🇷
  Haberler.com · Turkey · carries Wall Street Journal

  A four-sentence brief that the US ‘is claimed’ to have lost its measles-free status, per a Wall Street Journal report citing sources familiar with the matter, with CDC case figures and the 12-month rule for regaining it.
• 🇭🇰
  Metro Radio Hong Kong · Hong Kong

  Its headline states flatly that the US has lost measles elimination status, ending a 26-year record.

Where accounts conflict

The accounts differ on what the ruling rests on. KFF Health News reports two analyses, one by the CDC and one by an independent group of measles experts. CNN’s account says it is "not clear what data the committee relied on." The difference matters. If KFF is right, the federal government’s own scientists helped establish the loss.

They also clash over suppression. Multiple CDC officials, unnamed by KFF for fear of retaliation, say political appointees delayed or blocked MMWR articles. One said "measles reports from West Texas and New Mexico were intentionally shelved." Hilliard called the suggestion of deliberate suppression "false" and said report timing varies with data analysis and scientific review. IBTimes UK adds that KFF had not verified the claims, a caveat absent from the KFF text Texas Public Radio ran.

Room for disagreement

The strongest counter-reading is HHS’s own: the US lost its status to a decline in vaccination that predates this administration. KFF concedes part of the point, writing that childhood vaccination rates "have steadily declined since the COVID pandemic started." Canada lost its status a year earlier under different leadership and policies. That suggests a post-pandemic pattern across the continent, not a single government’s failure. Dr. Peter Hotez told CNN the formal status matters "much less" than the fact that "measles is back." On that view, the November 17 announcement is a formality, and the policy argument attached to it is beside the point.