U.S. Measles Cases Hit a 34-Year High as Country Faces Losing Its Elimination Status This Fall
The United States has already surpassed its entire 2025 measles case total, setting the country up for its worst year for the disease since 1991 — and putting it on track to potentially lose the measles elimination status it has held for the past 26 years when international health officials review the data this November.
Where the Numbers Stand
As of July 30, the CDC reported that U.S. measles cases for 2026 had already surpassed the 2,289 cases confirmed for all of 2025, according to CIDRAP, the infectious disease news service run by the University of Minnesota. Both totals represent the highest annual case counts the country has seen since 1991. The CDC’s weekly update noted 37 new outbreaks so far in 2026, with 94% of this year’s cases tied to those outbreaks — defined as clusters of three or more linked cases.
Of the confirmed cases, roughly all but 16 were locally acquired across 45 U.S. jurisdictions, meaning the vast majority of transmission is happening within communities rather than being brought in from abroad. Age data shows the outbreak is hitting young people hardest: 20% of confirmed cases involve children under age 5, and 49% involve children and teens between ages 5 and 19.
The current surge builds on an already record-setting 2025. According to KFF, U.S. states reported more than 3,800 measles cases between January 2025 and the end of March 2026 alone, with 2025 marking the worst year for measles since the disease was declared officially eliminated from the country in 2000.
What “Elimination Status” Actually Means — and Why It’s at Risk
Measles elimination, a designation the U.S. earned in 2000, doesn’t mean the disease never appears in the country. It means there has been no continuous domestic transmission chain lasting 12 months or longer. Individual outbreaks can and do occur, but historically they’ve been stopped before circulating within the country for a full year.
That status is now formally under review. The Pan American Health Organization’s Measles and Rubella Elimination Regional Monitoring and Re-Verification Commission is set to make its determination in November 2026, according to CIDRAP — a date that was pushed back from an initially planned review in mid-April, according to reporting from Johns Hopkins’ Bloomberg School of Public Health.
An analysis cited by CIDRAP found the U.S. “highly likely” to lose its elimination status when that review occurs. The analysis pointed to several elimination indicators the country is currently failing to meet: rather than fewer than one measles case per 10 million people annually — the threshold associated with elimination — the U.S. reported more than 90 cases per 10 million people in early 2026. Researchers also found that on 285 of the 376 days studied since January, the estimated transmission rate remained above 1, meaning each infected person was, on average, infecting at least one other person — the hallmark of sustained, ongoing spread rather than contained, imported outbreaks.
The U.S. wouldn’t be alone if it loses the designation. The United Kingdom, several other European countries, and Canada have all lost their own measles-free status in recent years amid similar patterns of declining vaccination and sustained transmission.
Where the Outbreaks Are Happening
The geography of the outbreak has shifted over the course of the year. The epidemic that’s driving much of the current case count traces back to a Texas outbreak that began in early 2025 with two imported cases and has since spread to 45 states, according to CIDRAP.
South Carolina had the largest single state outbreak recorded since the U.S. achieved elimination status, with the state’s health department confirming 997 cases in Spartanburg County before declaring the outbreak over on April 26, according to Healthline. Utah has since become a new focal point, with the state’s Department of Health and Human Services confirming over 500 cases in 2026, prompting what Drug Topics reported as enhanced monitoring measures, including wastewater-based detection and updated guidance recommending earlier MMR dosing, starting at 6 months, to protect infants who are too young for the standard vaccine schedule. Colorado has also confirmed cases this year, with the majority occurring in children ages 5 to 17, and a case was confirmed in Manhattan, prompting New York City’s health department to work on identifying people who may have been exposed at a restaurant.
Why Vaccination Rates Are the Root Cause
Public health researchers point consistently to declining childhood vaccination coverage as the central driver of the resurgence. National MMR vaccination coverage among kindergartners fell from 95.2% during the 2019–2020 school year to 92.5% during the 2024–2025 school year, according to CDC data cited by both Drug Topics and U.S. News. That figure matters because it falls below the greater-than-95% threshold generally considered necessary to sustain community, or herd, immunity against measles — one of the most contagious viruses known, capable of infecting up to 9 out of 10 unprotected people nearby if exposed, according to the CDC.
The consequences of even small shifts in vaccination rates are significant. U.S. News cited an estimate that just a 1-percentage-point decrease in childhood MMR vaccination coverage could produce roughly 17,000 additional measles cases, 4,000 hospitalizations, and 36 preventable deaths nationally each year. Among 2026’s confirmed cases, 93% occurred in patients who were unvaccinated or whose vaccination status was unknown, while only 4% occurred in people who’d received one MMR dose and 4% in those who’d received both recommended doses.
Dr. Dave Chokshi, chair of the Common Health Coalition, told U.S. News that vaccination represents one of the most effective investments the country can make in children’s health, but that failing to sustain high vaccination rates carries a cost for everyone, not just those who go unvaccinated.
FAQ
Has the U.S. lost its measles elimination status? Not yet. The Pan American Health Organization’s review commission is scheduled to make its determination in November 2026, but a recent analysis found the country “highly likely” to lose the designation based on current transmission data.
How many measles cases has the U.S. had in 2026? As of July 30, 2026, the CDC had confirmed more cases than were reported for the entirety of 2025 (2,289 cases), making 2026 on pace to be the worst year for measles in the U.S. since 1991.
Why is the U.S. at risk of losing elimination status? Elimination requires no continuous domestic transmission chain lasting 12 months or more. Current data shows sustained person-to-person transmission across most of the year, well above the incidence rate threshold associated with elimination.
What’s driving the outbreak? Declining childhood MMR vaccination rates are the primary factor. National coverage among kindergartners has fallen from 95.2% to 92.5% over five years, below the roughly 95% threshold needed to maintain herd immunity.
Which states have had the largest outbreaks? South Carolina’s Spartanburg County outbreak was the largest since U.S. elimination in 2000, with 997 cases before it was declared over in April. Utah has since become a new center of activity, with more than 500 cases confirmed in 2026.
Have other countries lost measles elimination status recently? Yes. The United Kingdom, several other European countries, and Canada have all lost their measles-free status in recent years amid similar declines in vaccination coverage.
Conclusion
The trajectory of this year’s measles outbreak — already surpassing 2025’s record total with months still remaining — has turned what was once a symbolic public health milestone into a live question for November’s review. Whether or not the U.S. formally loses its elimination status, the underlying trend researchers keep pointing to is the same: vaccination coverage has slipped below the threshold needed to reliably stop measles from spreading once it arrives, and until that changes, outbreaks of this scale are likely to keep recurring regardless of what the official designation ends up being.
Sources: CIDRAP, KFF, U.S. News & World Report, Johns Hopkins Bloomberg School of Public Health, Drug Topics, Healthline (reporting dated April-July 2026).