On a quiet week in November, a panel of regional health experts is weighing the question of whether North America can still claim one of medicine's hardest-won victories. For decades, vaccines held measles at bay in the United States, and the continent's standing as a place where the disease had been stopped rested on that long discipline. Now the evidence of continuous spread, and the slipping habits of vaccination that feed it, are forcing a reckoning whose outcome will be read as a verdict on how a society keeps faith with its children.
US and Mexico Near Losing Measles Elimination Status as Outbreaks Surge
Measles has caused about a dozen deaths in the U.S. over two years and 50 deaths in Mexico, most of them children younger than 5.
Eight deaths this year, more than any year in over three decades
Mark
Why does a label matter if the virus is already spreading?
Mimi
It's an official acknowledgment. Elimination means the disease no longer spreads continuously here. Losing it says measles is back to stay unless coverage rises.
Luke
But the decision isn't announced yet. The reporting says experts expect it, not that it has happened.
Mark
What's the test?
Mimi
Genetics. The commission checks whether one virus lineage has circulated for a year or more.
Luke
Right, and that data is reviewed behind closed doors. We can't see it, so we're relying on what experts predict.
Mark
The CDC says the designation isn't what protects people.
Mimi
Schwartz says vaccination does, and that the agency is working with local health departments. Critics say that's too muted.
Luke
That's a disagreement over emphasis. The critics' claims about a muted response are their characterization, and they blame Kennedy, who hasn't responded in this reporting.
Mark
And the human cost?
Mimi
Eight U.S. deaths this year, and 50 in Mexico, mostly children under 5.
Luke
Those are reported counts. Confirmed cases are probably an undercount, though the source doesn't say by how much.
The Pulse
- A commission of the Pan American Health Organization is reviewing genetic data to decide whether measles now circulates without interruption in the U.S. and Mexico.
- Over 5,400 confirmed cases in the U.S. this year, double last year's total, have pushed the country toward its worst measles year since 1991.
- Mexico has logged more than 20,500 cases and 50 deaths, most of them children under 5, as the outbreak has surged since early last year.
- Childhood vaccination has slipped to about 92 percent nationally, below the 95 percent threshold needed to block outbreaks, and federal officials insist the designation loss will not alter their response.
- PAHO Director Jarbas Barbosa will announce the decision next week, and whether federal vaccine policy shifts afterward remains the open question.
On a quiet week in November, a panel of regional health experts is weighing the question of whether North America can still claim one of medicine's hardest-won victories. For decades, vaccines held measles at bay in the United States, and the continent's standing as a place where the disease had been stopped rested on that long discipline. Now the evidence of continuous spread, and the slipping habits of vaccination that feed it, are forcing a reckoning whose outcome will be read as a verdict on how a society keeps faith with its children.
This week, a commission of the Pan American Health Organization is reviewing genetic data on measles, asking a question that carries weight far beyond the lab. Are the outbreaks that have moved across North America since 2024 part of one unbroken chain of transmission? If the same strain has circulated for a year or more, the United States and Mexico will lose the elimination status they earned after decades of vaccination. Canada lost its status last year, and PAHO officials say the final announcement will come next week.
The numbers are sobering. The U.S. earned elimination in 2000, when childhood vaccination coverage topped 97 percent. Experts say 95 percent is needed to keep an infected traveler from sparking a community outbreak. Coverage has slipped to about 92 percent nationally, with far lower rates in some places, partly because of discredited claims linking vaccines to autism. This year has already brought more than 5,400 confirmed U.S. cases and eight deaths, driven largely by an outbreak in Pennsylvania.
Mexico's toll is heavier, with more than 20,500 cases and 50 deaths, most of them young children. Researchers believe the Chihuahua outbreak began when an unvaccinated child traveled to a Texas outbreak zone and came home infected.
Federal officials say the designation will not change their approach and that vaccination is what protects people. Many public health leaders disagree, calling for a much louder vaccination push and faulting a muted federal response. The coming announcement, and whatever federal policy follows it, will show which path the country takes.
This week, behind closed doors, an advisory commission of the Pan American Health Organization is going through genetic data on measles. The question in front of it is whether the United States and Mexico still hold one of public health's clearest victories: the elimination of a disease that vaccines had kept from spreading freely in the U.S. for 30 years.
The commission is checking whether the same strain of virus has circulated continuously for a year or more in the outbreaks that have moved across North America since 2024. Dr. Amesh Adalja, an infectious disease physician near Pittsburgh and a senior scholar at the Johns Hopkins Center for Health Security, said the decision rests solely on genetics. If the answer is yes, the commission will conclude that sustained transmission has returned and that elimination status is gone. Canada lost its designation, held since 1998, last year. The commission will give its finding to PAHO Director Dr. Jarbas Barbosa, a former Brazilian health official, who makes the final call. PAHO officials say an announcement is being scheduled for next week.
The numbers behind the review are stark. The U.S. earned elimination status in 2000, after vaccination campaigns pushed childhood coverage above 97 percent. Experts say 95 percent is needed so that an infected traveler arriving in a community finds too many immune people for an outbreak to start. Coverage has been slipping for years, partly because of disproven claims linking the vaccine to autism. Last year the national childhood rate fell to about 92 percent, and it is far lower in some states and communities. Earlier this year, President Donald Trump claimed without evidence that the MMR vaccine is possibly "quite lethal."
Last year, large outbreaks hit Texas, Arizona, Utah and South Carolina. This year there are already more than 5,400 confirmed cases, double the 2025 total, driven mainly by an outbreak in Pennsylvania that has dwarfed the earlier ones. Eight people have died of measles in the U.S. this year, the most in any year in more than three decades, and it is the worst year for illnesses since 1991. Over the past two years the outbreaks have caused thousands of illnesses and about a dozen deaths. Measles typically starts with a high fever, then a rash on the face and neck. Most people recover, but serious complications such as blindness and brain swelling are more common in young children and in adults over 30.
Mexico's toll is heavier. It did not reach elimination status until 2016, years after the U.S. began vaccinating. Cases began surging early last year. Researchers think the outbreak in the northern state of Chihuahua began when an unvaccinated Mennonite child from there traveled to Gaines County, Texas, where an outbreak was under way, and returned infected. This week, Mexico has reported more than 20,500 confirmed cases and 50 measles-related deaths, most of them children under 5. Earlier this year, the World Health Organization confirmed that Armenia, Austria, Azerbaijan, Spain, the United Kingdom and Uzbekistan had also lost their status.
The U.S. response is contested. CDC Director Erica Schwartz said losing the designation will not change how federal officials handle outbreaks. In a statement she said vaccination, not the designation, protects Americans, and that the agency knows where transmission is occurring and is working with state and local health departments to reach those communities.
Many public health experts say the moment calls for a far louder vaccination campaign and more guidance for doctors. They fault what they describe as a politically fraught, muted federal response and blame Health Secretary Robert F. Kennedy Jr., a leading anti-vaccine voice before Trump put him in charge of the nation's health agencies. Kennedy has moved to shrink the childhood vaccination schedule and reshape a key vaccine advisory board, and he has praised Trump's executive order calling for spacing out the measles, mumps and rubella vaccine. Experts say that runs counter to medical groups' recommendations and would likely leave fewer children fully vaccinated. Dr. David Margolius, Cleveland's health director and a leader in a coalition of big-city health departments, called the expected decision a big deal and said it means moving backward.
The thing to watch is PAHO's announcement next week, and whether federal policy shifts afterward.
Notable Quotes
The measles elimination designation is not what protects Americans. Vaccination does.— CDC Director Erica Schwartz
It's a big deal. The decision represents us moving backward.— Dr. David Margolius, Cleveland health department director
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