US Measles Cases Hit 4,410 as Death Counts Diverge

The United States has 4,410 confirmed measles cases in 2026, a rise of 330 in seven days, the Centers for Disease Control and Prevention said Friday. That 8% jump landed while the agency’s national death tally stayed at two.

Pennsylvania has confirmed five measles-associated deaths and is still reviewing a sixth. The split is now the operational problem: states are burying people the federal dashboard does not yet count.

U.S. Cases Hit 4,410, the Most Since 1991

Friday’s CDC update covers cases reported as of October 15. The prior weekly total was 4,080. The 330 new infections in that one week already exceed the 285 measles cases the agency confirmed in all of 2024.

The 2026 count is 93% above the 2,289 cases logged for all of 2025, a year that itself had been the worst in decades. Forty-two outbreaks have been reported this year, after 48 in 2025 and 16 in 2024. An outbreak, in the CDC’s definition, is three or more related cases.

Of this year’s cases, 96% (4,228 of 4,410) are tied to outbreaks, including 2,844 from outbreaks that started in 2026 and 1,384 from outbreaks that began in 2025 and kept going. Only 18 cases were in international visitors. The rest were reported by 47 U.S. jurisdictions.

MEASLES IN THE UNITED STATES, THREE YEARS

Vaccination status is lopsided. The CDC says 96% of 2026 cases are in people who were unvaccinated or whose shots are unknown, with 2% after one MMR dose and 2% after two. Two doses are 97% effective at preventing measles, Pennsylvania’s health department says, citing the same figure used in federal guidance.

Age has shifted toward older patients. Children under 5 account for 742 cases (17%). Ages 5 to 19 account for 1,856 (42%). Adults 20 and older account for 1,787 (41%), up from 29% of cases in 2025. Age is unknown for 25 people.

Hospital stays this year stand at 451, or 10% of confirmed cases, including 15% of children under 5 (114 of 742), 5% of ages 5 to 19 (88 of 1,856), and 14% of adults (249 of 1,787). In 2025, 244 of 2,289 cases (11%) were hospitalized.

South Carolina has the next-largest CDC total after Pennsylvania, at 670 cases through October 15. Texas, site of the January 2025 outbreak that opened this wave, is at 192 this year. That West Texas outbreak reached 762 cases and was declared over on August 18, 2025. Kentucky is at 167. New York has declared a disaster emergency over measles, the first such statewide declaration in this outbreak.

Pennsylvania Confirms Five Deaths as CDC Lists Two

On October 16 the Pennsylvania Department of Health reported 1,260 measles cases across 43 counties, with 38 of those added since October 14. The state listed 238 hospital stays, about 19% of its confirmed cases, and only four infections in vaccinated people, less than 1% of the total.

Pennsylvania is more than a quarter of the national caseload on its own figures. Lancaster County remains the center of the outbreak, with Mifflin County next. The current surge, the department says, began in late April.

THE DEATH SCOREBOARD ON OCTOBER 16

• CDC national tally: Two measles deaths in 2026, with a note that the number can change after reviews.
• Pennsylvania confirmed: Five measles-associated deaths, and a Franklin County death still under review.
• 2025 U.S. total: Three measles deaths for the full year, two of them in children.

The five confirmed Pennsylvania deaths include two Lancaster County infants, an 18-year-old in Mifflin County who developed acute disseminated encephalomyelitis, a 40-year-old woman in Jefferson County with severe asthma and COPD, and a 20-year-old Lancaster woman with leukemia. Health officials have said the dead were unvaccinated; the infants were too young for routine MMR. A 39-year-old woman in Franklin County is the sixth death a local coroner has tied to measles. The state has not yet added her to its confirmed list.

Death from measles, the Pennsylvania department says, occurs in one to three patients per 1,000 cases. Five deaths against 1,260 confirmed infections sit above that range, which is why specialists argue that milder illnesses never reach a clinic. Paul Offit, director of the Vaccine Education Center at Children’s Hospital of Philadelphia, has said the state’s death count implies an outbreak much larger than the official case file.

The CDC still publishes two deaths for 2026 and does not name the states. Last year the agency counted three. Canada lost measles elimination status in 2025. The United States, which declared measles eliminated in 2000, is now in a second straight year of widespread domestic spread.

How a Measles Death Gets Counted Now

Until this fall, the CDC took measles death reports from state health departments through the Nationally Notifiable Diseases Surveillance System, the same channel used for cases. In September the agency said it would instead wait for the National Center for Health Statistics to list measles as the underlying cause on a death certificate.

That shift followed a public fight. After Pennsylvania announced two measles-associated deaths on August 25, HHS Secretary Robert F. Kennedy Jr. called the announcement premature and suggested the deaths might have been fabricated. CDC Director Erica Schwartz then kept those deaths off the public dashboard. An HHS rapid-response account later said the reporting decision was the CDC’s and that the agency had to separate what was known from what was unconfirmed.

Health policy researchers have mapped two federal systems count measles deaths as complements, not substitutes. NNDSS is built for fast outbreak tracking. The National Vital Statistics System, which NCHS runs, is built for complete cause-of-death records and often lags three months to a year. Using the slower system as the live scoreboard means official deaths will trail a fast outbreak.

The CDC also says it is working with the Council of State and Territorial Epidemiologists on a standard definition of a measles death. A CSTE spokesperson said that work is expected to take two to three months. Amy Heldman of CSTE has said a workgroup on measles deaths started earlier in the summer and was not launched at the CDC’s request.

Pennsylvania already publishes its own rule. Debra Bogen, the state’s health secretary, has said that by not acknowledging the deaths, the CDC obscures how serious measles has become.

HOW PENNSYLVANIA CLASSIFIES A MEASLES DEATH

• The window: Death must occur within 30 days of symptom onset in a person with clinical measles and a positive lab test, under Pennsylvania measles-associated death criteria.
• The exclusions: A death from an unrelated cause, such as a motor vehicle crash, is not counted, even if measles was present.
• The extras: Exposure to a confirmed case and supporting medical records are also weighed, and every listed criterion must be met.
• The cutoff: A death more than 30 days after symptoms start is not counted as measles-associated under the state rule.

Virologist Angela Rasmussen put the operational cost in one line: undercounting the epidemic, she wrote, makes it impossible to control. That is the second-order effect of a dashboard that moves slower than the virus.

Home Care Hides Cases in Plain Communities

Robert Hopkins, medical director of the National Foundation for Infectious Diseases, has been blunt about the case file itself.

Our detection of disease is only as good as our reporting.

Robert Hopkins, MD, medical director, National Foundation for Infectious Diseases

In Amish and conservative Mennonite communities, parents often keep sick children at home instead of taking them to a doctor who would file a report. Last year Pennsylvania’s health department estimated that about 25% of Lancaster County’s Amish population had received MMR. Those households are where this outbreak has bitten hardest, and they are also where a mild rash can pass without ever becoming a line on a CDC chart.

Measles remains infectious in the air and on surfaces for up to two hours after an infected person leaves. People can spread it four days before the rash and four days after. Symptoms start 7 to 21 days after exposure: fever, cough, runny nose, red eyes, then a rash that begins on the head and moves down. Pneumonia and brain swelling are the complications hospitals see. SSPE, a delayed brain disease, can still kill years after an apparent recovery.

The state’s own hospital rate, about 19%, is almost double the national 10% among confirmed cases. That gap fits a reporting pattern in which the people who show up in the data are the ones sick enough to need a bed, while others stay home.

State crews have tried to close that gap with shots rather than arguments. About 300 department staff are assigned to the response. Nurses have given more than 6,100 MMR doses at 210 pop-up clinics since late April, and more than 9,300 when state health centers are included. In a typical month, Pennsylvania providers give about 25,000 MMR doses. In September they gave more than 56,000. In the first two weeks of October they gave more than 23,000. Infants as young as 6 months in counties with community spread can get an extra early dose that does not replace the two routine shots.

About 280,000 Kindergartners Lack Documented MMR Shots

The national numbers that let measles run sit in school files, not in outbreak maps. CDC SchoolVaxView data for 2025-26 show 92.4% kindergarten MMR coverage, with about 280,000 kindergartners lacking documentation of the two-dose series. The agency’s measles page still treats coverage above 95% as the level that protects a community.

Exemptions from one or more vaccines rose to 4.2% from 3.6% the year before, about 155,000 children. Exemptions increased in 41 states and the District of Columbia, and 24 states now report exemption rates above 5%. DTaP coverage among kindergartners fell to 92.0% in the same school year. On August 17 the CDC issued a three-sentence note saying overall kindergarten vaccination rates “remained high” and that coverage had declined 0.1%, and it told parents to talk with their doctors.

Pockets matter more than the national average. A county can sit inside a well-vaccinated state and still fall far below 95% in a few schools or church districts. That is how 42 separate outbreaks can fire in a single year while most of the country never sees a case. Kennedy has blamed COVID-era missed well-child visits for the drop. State officials in Pennsylvania have blamed years of vaccine skepticism, including from the man who now runs HHS.

A Disease Detective Lands After a Public Standoff

Pennsylvania has now asked for an Epi-Aid, the CDC’s formal field-help program. The agency is sending an Epidemic Intelligence Service officer, a “disease detective,” to work on the ground. Kennedy, speaking Thursday in Virginia, said other states had taken federal help sooner.

The people of Pennsylvania suffered. Now, they’ve asked us to come in and help them, and I’m confident that we’ll bring that outbreak to a quick close.

Robert F. Kennedy Jr., HHS secretary, speaking in Virginia on October 15, 2026

He said Pennsylvania officials had politicized the outbreak and had not wanted aid from the Trump administration. He compared U.S. totals with much larger counts he cited for Mexico and Canada, and he said lockdown-era missed shots were the reason children were unprotected. Gov. Josh Shapiro has said Kennedy’s rhetoric is still sowing doubt in the communities where measles is spreading. The two men have been in that argument since August.

FROM TWO DEATHS TO A FEDERAL DEPLOYMENT

1. August 25, 2026: Pennsylvania announces two measles-associated deaths, the first the state has tied to the virus in decades.
2. Early September 2026: Kennedy questions those deaths. The CDC public tracker drops them and later says NCHS records will govern the national death count.
3. September 4, 2026: Lancaster County Coroner Stephen Diamantoni confirms a 6-week-old Amish girl with a rare genetic condition died of measles at home.
4. October 12, 2026: The Franklin County coroner reports a 39-year-old woman’s death as measles-associated; the state opens a review against its 30-day rule.
5. October 15, 2026: Kennedy pledges a quick close. The CDC’s then-current national case total is 4,080.
6. October 16, 2026: The CDC raises the U.S. total to 4,410. Pennsylvania reports 1,260 cases, five confirmed deaths, and 238 hospital stays.

The officer heading to Pennsylvania can help with contact tracing, lab work, and clinic logistics. The officer cannot make NCHS post a death certificate faster, and cannot finish the CSTE definition on a field schedule. For the next two to three months, the country will still be adding cases against a federal death number that the states no longer recognize as complete.

Friday’s 330 new infections did not wait for that definition. Neither will next week’s.

Disclaimer: This article is news reporting on public case counts, death classifications, and vaccination data, and it is for information only. It is not medical advice, a diagnosis, or a recommendation about whether any person should receive or decline the MMR vaccine or any other shot. Readers who have questions about measles exposure, symptoms, pregnancy, immune conditions, or immunization should speak with a licensed physician, pediatrician, or local health department before acting. Case totals, death counts, and outbreak maps reflect the CDC, Pennsylvania Department of Health, and other sources cited as of the dates given in the article and will change as investigations close and late reports arrive.