The United States has recorded more than 5,000 measles cases in a single year for the first time since 1991, according to new data from the Centers for Disease Control and Prevention. The agency reported 5,182 confirmed cases as of November 5, a figure that has more than doubled last year's total and now puts the country's hard-won measles-free status at risk.
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| A child receives a measles vaccination. The CDC says nearly all of the 5,182 confirmed measles cases in the US in 2026 have been in unvaccinated people. (File photo) |
Measles, a highly contagious disease the United States declared eliminated in 2000, has roared back in 2026. The CDC's latest weekly update, released on November 6, added 330 cases in a single week, and the total is expected to keep climbing while outbreaks continue in dozens of states — just days before an international review decides whether America keeps its official measles elimination status.
The Numbers Behind the Surge
The scale of the 2026 outbreak is now clear in the CDC's own figures. The 5,182 confirmed cases reported as of November 5 span 45 states plus Washington, D.C., according to USA Today, and the vast majority — 4,993 cases — are linked to known outbreaks. Forty-three separate outbreaks have been recorded so far this year.
The 2026 total is more than double the 2,289 cases recorded in all of 2025, and the highest annual count the CDC has reported since 1991. The weekly pace has not slowed: the latest update rose 330 cases, or 6.8 percent, from the 4,852 reported the previous week.
The CDC reported 562 hospitalizations due to measles this year, about 11 percent of confirmed cases. Children and teenagers account for nearly 60 percent of infections — children under five make up 18 percent of cases and those aged five to 19 account for 41 percent. Nearly all of those infected were unvaccinated, health authorities say.
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| The Centers for Disease Control and Prevention reported 5,182 confirmed measles cases in the US as of November 5, 2026, the highest annual total since 1991. (File photo) |
Pennsylvania at the Center of the Outbreak
No state has been hit harder than Pennsylvania, which now has the country's largest measles outbreak. The state's Department of Health has reported 1,487 cases this year, according to state health data cited in multiple reports, and the outbreak there has become the focal point of a dispute over how measles deaths are counted.
The CDC's national tally lists four deaths attributed to measles in 2026, compared with three during the whole of 2025. But state health departments have reported more. According to Euronews, state authorities have reported at least eight measles-related deaths nationwide, including among very young children. Pennsylvania alone reports six deaths, using a "measles-associated" classification that counts any death occurring within 30 days of symptom onset unless it is clearly unrelated.
The CDC said it is working with the Council of State and Territorial Epidemiologists to settle on a standard definition for a measles death. Its counts also tend to lag behind state reporting, because figures are only updated weekly after certain reporting parameters are met — so the true national toll may already be higher than the federal figure suggests.
The Pennsylvania outbreak has been severe for months. The state passed 1,400 cases in early November, echoing the 2025 outbreak in Texas, which killed three people and helped trigger the international review now facing the United States.
Why Measles Is Spreading Again
Public health experts point to one central cause: falling vaccination rates. Measles is one of the most contagious diseases known to medicine, and stopping its spread requires about 95 percent of a community to be immunized. The United States has slipped below that line.
Vaccination coverage among American kindergarteners has fallen from 95.2 percent during the 2019-2020 school year to 92.4 percent in the 2025-2026 school year, according to CDC figures cited in the reporting. That decline, spread across thousands of schools and communities, has opened the gaps that measles needs. The CDC's immunization office has warned that overall coverage sits at roughly 92 percent for the first dose and 85 percent for the second, short of the threshold needed to halt transmission.
The shift is not only about access. A Pew Research Center survey in September found that 22 percent of American adults now describe the measles vaccine as "risky," up from 15 percent a year earlier. Health officials say that growing skepticism, combined with uneven coverage, has left the country vulnerable to a disease it once had under control.
The context is striking. Before the measles vaccine was introduced in 1963, an estimated 400 to 500 people died from the disease every year in the United States, according to the CDC. The vaccine drove cases down so far that measles was declared eliminated in the country in 2000, meaning the virus was no longer spreading continuously within its borders. The 2026 surge is now testing whether that achievement can survive.
A Review That Could Cost the US Its Status
The timing of the CDC's update could hardly be more consequential. The United States is facing a review of its measles elimination status by the Pan American Health Organization, which is expected to assess the country's progress in controlling transmission during its meeting on November 10. USA Today reported that the country is less than a week away from the review, which follows the 2025 Texas outbreak that killed three people.
Losing elimination status would be a symbolic and practical blow. The designation, granted in 2000, has marked one of American public health's great successes. Its loss would signal to the world that the disease has re-established a foothold in a country with one of the most advanced health systems on earth.
Health officials have stressed that measles is preventable. The measles, mumps and rubella vaccine, known as MMR, is safe and highly effective, and two doses provide about 97 percent protection. The CDC has urged parents to make sure their children are up to date on vaccinations — the vaccine remains the best defense against a disease that can cause pneumonia, brain swelling and death, particularly in young children.
What This Means
The 5,000-case milestone is more than a number. It marks the moment a disease the United States had beaten came back at a scale not seen in a generation, and shows how quickly decades of public health progress can unravel when vaccination coverage slips.
The outbreak has also become a test of the country's public health institutions. The CDC, which publishes its counts weekly, has faced questions about the pace of its reporting and the gap between its death tally and those of the states. The dispute over the death count — four according to the CDC, at least eight according to state reports — has added confusion to an already alarming picture, and the agency's effort to standardize the definition with state epidemiologists is an acknowledgment that the current numbers do not tell a single, clean story.
The surge also arrives in a charged political atmosphere. Cases hit their highest level in more than three decades in a year when the administration has attempted to change the childhood vaccine schedule and promoted ideas about vaccines that health experts have described as disproven, according to USA Today. Whatever the politics, the epidemiology is unambiguous: measles spreads where vaccination rates fall, and rates have fallen.
For families, the implications are immediate. With outbreaks active in 45 states and the District of Columbia, exposure is no longer a distant risk confined to one region. Health officials advise parents to check their children's vaccination records, and adults unsure of their immunization status to consult their doctors, particularly before travel or gatherings.
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| Health officials say the measles, mumps and rubella vaccine remains the best protection against the disease, which can cause pneumonia and brain swelling in young children. (File photo) |
What Happens Next
The most important date on the calendar is November 10, when the Pan American Health Organization reviews whether the United States keeps its measles elimination status — a difficult case to make while cases are still rising by hundreds a week.
The CDC is expected to release more detailed case reports in the coming weeks, and the national total is expected to keep rising while outbreaks continue. State health departments, led by Pennsylvania, will keep publishing their own counts, which have consistently run ahead of the federal tally.
The longer arc will be decided by vaccination. Public health experts say the outbreak will only be brought under control when coverage climbs back toward the 95 percent threshold, and that will require reaching the families who have delayed or skipped the MMR vaccine. Until then, the United States faces the prospect of ending 2026 with its worst measles year in 35 years — and with a disease it once eliminated firmly back on American soil.
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