Utah confirmed its 663rd measles case this week. The state's outbreak — the largest in over forty years and the basis for Monday's paper on November's PAHO calendar — appears to be tapering. Thirty-seven cases were reported in the last three weeks, against 121 in the three weeks leading up to April. [1] That is the rare good news. The bad news is that the geographic map is widening.

Austin Public Health confirmed Travis County, Texas's first 2026 measles case on May 7 — an unvaccinated adult who had recently returned from international travel and sought care at St. David's emergency room during their infectious window. [2] Michigan is now at seven cases across Washtenaw, Macomb, Monroe, and Ottawa counties, three of them in the past month. [3] The CDC's last public count, from May 7, holds at 1,842 confirmed cases nationally; the Thursday-noon refresh is expected to land this afternoon. [4] Last year's full-year total was 2,285. The 2026 number will pass it before summer.

Inside Utah, the hotspots have not moved much. The Southwest Utah Public Health Department's jurisdiction — Washington, Iron, Kane, Beaver, and Garfield counties — accounts for 263 of the state's cases, or about 40%. Utah County has 109; the Central Utah Public Health Department's area has 83; the TriCounty area (Daggett, Duchesne, Uintah) has 73; Salt Lake County has 62, the same number reported since early April. [1] The slowdown is broad: state epidemiologist Leisha Nolen has been telling local press that warmer weather and outdoor air may be doing some of the work that vaccination did not. Fifty-one of the 663 confirmed cases have been hospitalized. Of those infected, 567 were unvaccinated, 64 were vaccinated, and 32 have an unknown status. About 430 are under eighteen. [1]

The denominator is the part the slowdown obscures. South Carolina's outbreak, which produced 997 cases and made the state April's epicenter, concluded on April 27 — no new cases for forty-two days from the last reported rash onset. That cessation pulled the national three-week rolling average down. Utah's slowdown, in the same window, pulls it further. The CDC's Thursday print will reflect the deceleration. But the new state additions — Texas (Travis County, joining 175 statewide cases), Michigan (7), North Dakota (31 total), Arizona (71 total), Florida (between 129 and 143 depending on outlet), Washington (31), Idaho (23) — are the signal that endemic transmission is becoming geographically distributed rather than concentrated. [4]

The PAHO meeting that will assess U.S. measles elimination status, originally scheduled for April, was deferred to November at the U.S. government's request. The criterion is sustained local transmission of a single strain for twelve months. Stanford's Bonnie Maldonado told Healio this spring that the U.S. measles count is "concerning" and that the country's elimination status — held since 2000 — is at risk. [3] The CDC's Thursday refresh will not change the elimination math. The May-to-November window will.

What changes the math is vaccination coverage in the geographies still acquiring cases. Travis County is a public-health department with the resources to do contact tracing and post-exposure prophylaxis well; the international-travel-import pattern is the kind of single-case node that high vaccination coverage absorbs without secondary transmission. Texas as a whole, with 175 cases this year, is at the threshold where one missed contact in an under-vaccinated community becomes a new outbreak. Michigan's seven cases across four counties is the pattern that turns into Utah's 663 if the response is slow. The CDC has been quietly reinforcing state collaboration through Epidemic Intelligence Service deployments; acting director Jay Bhattacharya posted a March 2 video on the CDC's X account [5] emphasizing the MMR vaccine. The video was its own news at the time, given the broader anti-vaccine register inside HHS this year.

For now, the Utah numbers are the encouraging line in the report. The widening map is the line that holds the elimination question.

-- NORA WHITFIELD, Chicago