The Centers for Disease Control and Prevention confirmed on Tuesday, October 20, that a third person has died of measles in the United States this year, as the country endures its largest measles outbreak in decades, with 4,410 confirmed cases nationwide as of October 15.
A Third Measles Death, and a Counting Dispute
The CDC confirmed the death on Tuesday after the National Center for Health Statistics verified that measles was listed as the underlying cause of death on a death certificate, Al Jazeera reported. The agency did not say in which state the death occurred.
That silence matters. The CDC's national tally remains lower than the number of measles-related deaths reported by state officials — particularly in Pennsylvania, the state hardest hit by the outbreak. Pennsylvania had reported 1,286 cases and five deaths as of Monday, all of them in unvaccinated individuals, according to state health authorities cited by Reuters.
The gap isn't an accident. Under Health Secretary Robert F. Kennedy Jr., the CDC shifted to relying on mortality data from the National Center for Health Statistics rather than state health departments' reports — a change that has drawn scrutiny. The CDC has told Al Jazeera it is working with the Council of State and Territorial Epidemiologists to establish a standardized definition for measles deaths, and will use the national mortality data as its measure in the meantime. The agency says its death count could change as reviews are completed.
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Pennsylvania: The Epicenter
Pennsylvania's outbreak has spread well beyond its initial epicenter in Lancaster County, with 42 counties now reporting cases, Al Jazeera reported. The state's 1,286 cases make it the hardest-hit state in the country, and officials are reviewing an additional death reported by the Franklin County coroner.
Last week, the CDC agreed to deploy additional support to Pennsylvania to help investigate the outbreak, after the state formally asked for federal aid through the agency's Epi-Aid emergency response program, Reuters reported.
In neighboring New York, the state health department reported 162 measles cases as of October 17. Governor Kathy Hochul declared a statewide disaster emergency earlier this month and said she would seek federal help.
Why It Matters
"We should not have any measles deaths in the United States," said William Moss, an epidemiology professor at the Johns Hopkins Bloomberg School of Public Health, noting the disease was declared eliminated in the country in 2000.
He called for stronger federal efforts to boost vaccination in vulnerable communities and tackle misinformation, Reuters reported. Measles is a highly contagious viral disease, but it can be prevented through the measles, mumps, and rubella vaccine, which is about 97% effective after two doses.
The deeper problem is trust. When the federal government and state health departments can't agree on something as basic as how many people have died, public confidence in the response takes a hit. Pennsylvania's health officials count five deaths; the CDC counts three nationally. Both may be right under their own definitions — but a family deciding whether to vaccinate a child hears only the confusion.
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What Happens Next
The outbreak shows no sign of stopping. The CDC's case count — 4,410 as of October 15 — keeps climbing, and the agency's own warning that its death figure "could change as further reviews are completed" suggests the federal tally may rise to meet the states'.
Two things to watch: whether the CDC finalizes a standardized definition for measles deaths with state epidemiologists, which would close the federal-state gap; and whether the Epi-Aid deployment in Pennsylvania manages to slow an outbreak that has already reached 42 counties. With winter travel season approaching, health officials will be bracing for the virus to find new under-vaccinated pockets.
Key Takeaways
- The CDC confirmed a third measles death in the US on Tuesday, Oct. 20, matching the previous year's total.
- 4,410 measles cases have been confirmed nationwide as of October 15 — the largest US outbreak in decades.
- Pennsylvania is the epicenter: 1,286 cases and five deaths reported by the state, all in unvaccinated individuals.
- The federal tally lags state counts because the CDC now uses national mortality data instead of state health department reports.
- The MMR vaccine is about 97% effective after two doses, and experts say no one should be dying of measles in the US.
Frequently Asked Questions
How many measles deaths has the US had in 2026?
The CDC counts three measles deaths nationally as of October 20, 2026. State health departments report higher numbers — Pennsylvania alone reports five measles-associated deaths. The gap comes from the CDC's switch to counting deaths from National Center for Health Statistics mortality data rather than state reports.
How many measles cases are there in the US in 2026?
The CDC reported 4,410 confirmed measles cases nationwide as of October 15, 2026 — the largest US outbreak in decades. Two deaths had been reported in September before the third was confirmed on October 20.
Why is Pennsylvania the hardest-hit state?
Pennsylvania has reported 1,286 cases as of October 19, with the outbreak spreading from its Lancaster County epicenter to 42 counties. The CDC deployed Epi-Aid emergency support after the state formally requested federal help. New York, its neighbor, has reported 162 cases.
Why does the CDC's death count differ from state numbers?
Under Health Secretary Robert F. Kennedy Jr., the CDC switched to tracking measles deaths using National Center for Health Statistics mortality data instead of state health department figures. The agency says it is working with state epidemiologists to establish a standardized definition for measles deaths.
Is measles preventable?
Yes. Measles is a highly contagious viral disease, but the measles, mumps, and rubella (MMR) vaccine is about 97% effective after two doses, according to the CDC. Johns Hopkins epidemiologist William Moss said, "We should not have any measles deaths in the United States," noting the disease was declared eliminated in 2000.
What is the CDC doing about the outbreak?
The CDC agreed last week to deploy additional support to Pennsylvania through its Epi-Aid emergency response program to help investigate the outbreak. Governor Kathy Hochul declared a statewide disaster emergency in New York earlier this month and said she would seek federal help.