A protection that the United States had held for more than two decades has quietly slipped away, not through a single catastrophe but through a slow accumulation of gaps in the shield that vaccines once built. Measles, a disease the country had nearly forgotten, has found its way back through communities where immunity has thinned, and the regional health authority has now recognized what those thinning walls allowed. The story sits within a longer human arc, one that began with the grim childhood toll of the early twentieth century and the relief that a vaccine brought in 1963. Whether this m
U.S. Loses Measles Elimination Status for First Time Since 2000 as Cases Surge Past 5,400
Over 5,400 measles cases, more than 590 hospitalizations and at least six deaths have been recorded in 2026, with infants, pregnant women and immunocompromised people most at risk.
Several generations of Americans grew up without ever encountering measles.
Mark
Why does a label like "elimination status" matter if the cases are already happening?
Mimi
Because it marks the point where measles stopped being something that arrives and burns out, and became something that sustains itself here. The rule is no local transmission chain lasting 12 months, and about a third of this year's cases come from outbreaks that began in 2025.
Luke
Worth noting the decision itself is confirmed by researchers who know of it, speaking to KFF Health News. PAHO's own announcement is set for Tuesday.
Mark
What changes for ordinary clinics?
Mimi
Gounder says doctors should think of measles in anyone with fever and rash, even without travel. That's a shift from treating it as an imported illness.
Luke
She also says the U.S. may become an exporter of measles. That's a projection, not something the reporting shows has happened.
Mark
How do the death counts fit together?
Mimi
The CDC lists at least six deaths. Pennsylvania reports seven by itself, and New York and Wisconsin one each.
Luke
Right, and the source doesn't reconcile those. The state figures and the CDC tally clearly differ, so the true number is unsettled here.
Mark
Is there a clear path back?
Mimi
Vaccination at 95% or higher, strong surveillance, rapid response. Gounder points to state exemption rules, and legislatures return in January.
Luke
The 2 to 4 point kindergarten gain is her citation about states that ended nonmedical exemptions. It suggests policy can help, but the piece doesn't say it would be enough to restore status.
Le Pouls
- The country has lost its measles elimination status for the first time since 2000, a verdict that lands like an alarm across hospitals and health offices.
- More than 5,400 cases this year, more than double 2025's total, are overwhelming emergency rooms and pediatric clinics that must now suspect measles in any feverish patient with a rash.
- Nearly all infections strike people who were not vaccinated, and infants, pregnant women and immunocompromised people are left exposed as outbreaks refuse to die out.
- Officials are working to rebuild community immunity above 95 percent, but the path back depends on state legislatures that reconvene in January to decide school exemption rules.
A protection that the United States had held for more than two decades has quietly slipped away, not through a single catastrophe but through a slow accumulation of gaps in the shield that vaccines once built. Measles, a disease the country had nearly forgotten, has found its way back through communities where immunity has thinned, and the regional health authority has now recognized what those thinning walls allowed. The story sits within a longer human arc, one that began with the grim childhood toll of the early twentieth century and the relief that a vaccine brought in 1963. Whether this moment becomes a lasting reversal or a turning point will depend on choices lawmakers and families make in the coming months.
The United States has lost its measles elimination status, the first time it has fallen short since the country earned that recognition in 2000. The Pan American Health Organization, the regional arm of the World Health Organization, made the determination after finding that outbreaks had kept spreading for twelve months or longer. Researchers familiar with the decision confirmed it to KFF Health News, and the agency is expected to explain its reasoning at a news conference on Tuesday.
The numbers behind the ruling are sobering. The CDC has counted more than 5,400 cases so far in 2026, more than double the 2,242 recorded in all of 2025. Hospitalizations have passed 590, and at least six people have died. Pennsylvania has been hit hardest, with more than 1,500 cases and seven deaths. Almost all of those infected were unvaccinated or of unknown status, and the people most at risk are infants, pregnant women and those whose immune systems cannot tolerate the illness.
Experts describe the setback as both frustrating and avoidable. The MMR vaccine is about 97 percent effective, yet vaccination rates in many communities have slipped below the level needed to stop the virus from finding new hosts. Dr. Céline Gounder noted that when immunity is high, a small outbreak fades quickly, but when gaps accumulate, transmission can continue for months.
Regaining the status will require returning to a point where there is no local spread and no outbreak lasts a year, with the data verified by PAHO. Officials say vaccination coverage of at least 95 percent is the goal. Much of the work will happen in statehouses, where lawmakers will soon decide how easily families can opt out of school vaccine requirements.
The United States has lost its measles elimination status for the first time since the country earned it in 2000. Researchers with knowledge of the decision confirmed it on Saturday to KFF Health News, a CBS News partner. The ruling comes from the Pan American Health Organization, the regional office of the World Health Organization covering North and South America, which is scheduled to hold a news conference on Tuesday.
The standard is specific. By the WHO's definition, a country has eliminated measles when it has no locally transmitted infections and no outbreaks lasting 12 months or longer. The U.S. did not meet that test. According to CDC data, about a third of this year's cases are tied to outbreaks that began in 2025 and have never stopped spreading.
The numbers explain why. The CDC counted 2,242 cases in 2025, linked to 48 outbreaks, with 245 hospitalizations, mostly of children, and three deaths. Infections were confirmed in at least 44 states, and it was the highest total in more than three decades. In 2026 the count has reached 5,412, more than double, with over 590 hospitalizations and at least six deaths, and some states report additional fatalities. Cases have been confirmed in 45 states and Washington, D.C. The agency says 43 new outbreaks, defined as three or more related cases, have been reported this year.
Pennsylvania has had the largest outbreak, with more than 1,500 cases and seven deaths reported by state health officials. New York and Wisconsin have each reported one death. Almost all the cases are in people who were not vaccinated: 96% of those infected in 2026 were unvaccinated or unsure of their status, and only 2% were fully vaccinated.
CBS News medical correspondent Dr. Céline Gounder explained what losing the status means. When vaccination is high, a case or small outbreak fizzles out. With this many gaps in immunity, there can be ongoing chains of transmission. She said emergency rooms and pediatricians now need to consider measles in anyone with fever and rash, whether or not they have traveled overseas, and that the U.S. may become an exporter of measles to other countries.
Dr. Omer Awan, an epidemiologist and senior public health contributor for Forbes, called the setback frustrating and heartbreaking, because the tool to fight it exists. The MMR vaccine is 97% effective at preventing measles, he noted, and the country is simply not using it enough. He said babies, pregnant women and people with weakened immune systems, who cannot be vaccinated and depend on community immunity, will bear the brunt, facing complications such as pneumonia and encephalitis. Measles can also cause severe lung and brain infections, leading to cognitive problems, deafness or death.
The history is a long one. The CDC began collecting national data in 1912, and the first decade saw about 6,000 measles deaths a year. Between 1953 and 1963, nearly every child caught measles before 15, with 3 to 4 million infections a year and 400 to 500 deaths annually. The vaccine became widely available in 1963, and by 1981 reported cases had fallen 80% from the previous year. Elimination was declared in 2000. Later flare-ups, including a 2015 outbreak traced to overseas visitors at Disneyland and a 2018-19 outbreak in New York contained partly by curbing vaccine exemptions, were far smaller than today's.
Regaining status means going back to no local spread and no outbreak lasting over a year, with data submitted to and verified by PAHO. The organization says the best protection is vaccination of 95% or higher, backed by sensitive surveillance, laboratory capacity and rapid outbreak response. Childhood vaccination rates have fallen in many communities, often below that threshold. Awan pointed to countering misinformation and expanding vaccination campaigns. Gounder noted that states set school vaccine rules, that nine states made opting out easier in 2025, and that states ending nonmedical exemptions saw kindergarten vaccination rise 2 to 4 points. Most legislatures reconvene in January, when lawmakers will write next year's exemption rules.
Citations marquantes
It means ERs and pediatricians need to consider measles in anyone with a fever and rash, whether they've traveled overseas or not.— Dr. Céline Gounder, CBS News medical correspondent
The tools are at our disposal, we just aren't using the tools that can help us mitigate the spread and beat measles.— Dr. Omer Awan, epidemiologist and Forbes public health contributor
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