RELATED | First confirmed measles case in eastern Idaho resident since 1991<\/a><\/p>\nPublic health scientists around the country are investigating whether the now-ended Texas outbreak is linked to active ones in Utah, Arizona and South Carolina. But doctors and scientists say the U.S. \u2014 and North America overall \u2014 has a measles problem, regardless of the decision.<\/p>\n
\u201cIt is really a question of semantics,\u201d said Dr. Jonathan Temte, a Wisconsin family physician who helped certify the U.S. was measles-free in 2000. \u201cThe bottom line is the conditions are sufficient to allow this many cases to occur. And that gets back to de-emphasizing a safe and effective vaccine.\u201d<\/p>\n
Last year, the Centers for Disease Control and Prevention confirmed 2,242 measles cases across 44 states \u2014 the most since 1991 \u2014 and nearly 50 separate outbreaks.<\/p>\n
The problem has been years in the making, as fewer kids get routine vaccines due to parental waivers, health care access issues and rampant disinformation. More recently, Trump administration health officials including Health Secretary Robert F. Kennedy Jr. have questioned and sown doubt about the established safety of vaccines at an unprecedented level while also defunding local efforts to improve vaccination rates.<\/p>\n
\u201cThe most important thing that we can do is to make sure the people who aren\u2019t vaccinated get vaccinated,\u201d said Jennifer Nuzzo, director of Brown University\u2019s Pandemic Center. \u201cWe have not issued a clear enough message about that.\u201d<\/p>\n
A Department of Health and Human Services spokesperson said Thursday that Kennedy has emphasized vaccines as the best way to prevent measles, adding that the CDC is responding to outbreaks and working to increase vaccination rates.<\/p>\n
In a briefing Tuesday, department officials said they don\u2019t yet have evidence that a single chain of measles has spread for a year.<\/p>\n
But CDC\u2019s principal deputy director said he would consider the loss of elimination status to be the \u201ccost of doing business\u201d globally.<\/p>\n
\u201cWe have these communities that choose to be unvaccinated,\u201d said Dr. Ralph Abraham. \u201cThat\u2019s their personal freedom.\u201d<\/p>\n
Measles finds the unvaccinated <\/p>\n
There is little room for error in trying to stop measles. The virus is one of the most contagious, infecting 9 out of every 10 unvaccinated people exposed. Community-level protection takes a 95% vaccination rate. The current rate nationally is 92.5%, according to CDC data, but many communities fall far below that.<\/p>\n
The patient in Texas\u2019 first known case developed the telltale rash on Jan. 20, 2025, according to state health department data.<\/p>\n
From there, the outbreak exploded. Officially, 762 people fell ill, most of them in rural Gaines County, and two children died. Many more got sick and were never diagnosed: 182 potential measles cases among children in Gaines County went unconfirmed in March 2025 alone, state health officials said, a possible undercount of 44% in that county.<\/p>\n
Such data gaps are common, though, making it especially hard to track outbreaks. Many people living in communities where the virus is spreading face barriers, including access to health care and distrust of the government.<\/p>\n
Contact tracing so many cases is also expensive, said behavioral scientist Noel Brewer, who chairs the U.S. committee that will finalize the data for international health officials. Research shows a single measles case can cost public health departments tens of thousands of dollars.<\/p>\n
CDC data on measles is still among the best worldwide, Brewer said, but \u201cthe U.S. has changed its investment in public health, so we\u2019re less able to do the case tracking that we used to do.\u201d<\/p>\n
Genetic sequencing can fill some gaps.<\/p>\n
Scientists have confirmed the same measles strain in Texas, New Mexico, Utah, Arizona, South Carolina, Canada, Mexico and several other North American countries, said Sebastian Oliel, a spokesperson for the Pan American Health Organization, which plans to make the final decision on U.S. measles elimination at an April 13 meeting.<\/p>\n
But that\u2019s not always enough to say the outbreaks are connected. Genetically, the measles virus doesn\u2019t change as often as, say, flu.<\/p>\n
\u201cWithin an outbreak, everybody is going to look the same,\u201d said Justin Lessler, a University of North Carolina disease researcher.<\/p>\n
The key question may then be how PAHO experts will navigate final data gaps, said Dr. Andrew Pavia, a Utah physician and longtime CDC consultant.<\/p>\n
\u201cMy best guess is we will lose elimination status,\u201d Pavia said. \u201cThe case for this not being continuous transmission is tenuous, and I think they are likely to err on the side of declaring it a loss of elimination status.\u201d<\/p>\n
Oliel said when there is a case of unknown origin in a country with ongoing local spread, \u201cthe most conservative approach is to consider the case part of the existing national transmission.\u201d<\/p>\n
Mexico also up for review <\/p>\n
PAHO will review Mexico\u2019s measles-free status alongside the U.S., Oliel said. The country\u2019s largest outbreak has roots in Texas. It started when an 8-year-old boy from Chihuahua state got sick after visiting family in Seminole, Texas. Since last February, 6,000 people have gotten sick in Mexico, and 21 have died in Chihuahua state.<\/p>\n
But under PAHO\u2019s definition of elimination, borders matter. If, for example, the chain of measles that started in the U.S. spread to Mexico and then returned to the U.S. anew, it would be considered a new chain, experts said. Still, many experts call that standard outdated.<\/p>\n
What\u2019s clear is that measles found ample ground in the U.S. in 2025, infiltrating schools and day cares, churches, hospital waiting rooms and a detention center. New Mexico logged 100 cases and one adult died. Kansas officials spent seven months trying to control an outbreak that sickened nearly 90 people across 10 counties. Ohio confirmed 40 cases. Montana, North Dakota and Wisconsin each had 36.<\/p>\n
Now, more than 800 people have gotten sick across Utah, Arizona and South Carolina since late summer, with no end in sight.<\/p>\n
\u201c2025 was the year of measles,\u201d Brewer said. \u201cWill 2026 be the year of rising or falling measles cases? Does it get worse, or does it get better? No one knows the answer.\u201d<\/p>\n
The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute\u2019s Science and Educational Media Group and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.<\/p>\n
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