Measles Deaths Count Sparks CDC-Pennsylvania Clash

The federal government says no one has died of measles in the United States this year. Pennsylvania says four people have. Both are official tallies of measles deaths, published days apart, and the gap between them has become one of the sharpest disputes in American public health.

At issue is a single phrase in the official tally of measles deaths: measles-associated. Pennsylvania uses it. The CDC's national count now refuses to count measles deaths, until a new standardized definition says it may.

Zero measles deaths on the federal dashboard

In its September 18 weekly update, the CDC reported 3,471 confirmed measles cases nationwide as of September 17, up from 3,294 the week before. That weekly gain of 177 infections marked the sixth straight week of triple-digit increases, according to the Center for Infectious Disease Research and Policy. For the broader picture of the outbreak behind those numbers, see GenZ NewZ's report on the national measles surge.

But the measles deaths column on the same dashboard read zero, flagged with an asterisk: "The National Center for Health Statistics does not currently have any death records from 2026 that indicate measles is the underlying cause." The agency has shifted to using mortality data from the National Center for Health Statistics for its national measles death count, moving away from its previous reliance on state health departments, as reported by Reuters.

In a September 21 statement to Becker's Hospital Review, the Department of Health and Human Services defended the change. "Pennsylvania may classify deaths as 'measles-associated' under its state surveillance definition, but CDC is working with the Council of State and Territorial Epidemiologists to establish a standardized definition for measles deaths," a spokesperson said. Until that definition exists, the agency said, it will apply the same national standard to every state.

The decision to withhold the deaths came from new CDC Director Erica Schwartz, who took over the agency in August, the Washington Post reported, citing officials who spoke anonymously. According to that reporting, she ordered staff to exclude the Pennsylvania-reported deaths then on the books and to post a note stating that the report "does not establish whether measles caused or contributed to the deaths."

What Pennsylvania counts as measles deaths

Pennsylvania's health department counts four measles deaths in its outbreak: two babies and two adults. The newest were an eighteen-year-old and a forty-year-old, both unvaccinated, the department said.

The dispute's roots stretch back to August 25, when Governor Josh Shapiro announced the deaths of the infants and blamed anti-vaccine rhetoric for falling vaccination rates and rising case counts. The CDC posted condolences on X using Pennsylvania's "measles-associated" language. Health Secretary Robert F. Kennedy Jr. then suggested the deaths might have been fabricated by a member of the governor's staff. Two days later, the CDC walked back its post, saying it appreciated Kennedy's efforts to clarify conflicting information.

On August 30, the agency changed its dashboard's death count from 2 to the asterisk, with no new evidence arriving in the two days between to explain the shift, as Philly Voice reported. The Lancaster County coroner attributed one infant's death to measles and described the other's death, from a ruptured spleen, as measles-related.

Pennsylvania applies "measles-associated" when laboratory or epidemiologic evidence of measles is present, even if the medical certifier did not list the disease as the immediate cause of death. That approach is standard in disease surveillance, and it exists for a reason: measles kills mostly through complications, particularly pneumonia and encephalitis, which appear on death certificates under their own names. A system that counted only deaths where a certifier wrote "measles" on the death certificate would undercount the disease substantially.

That Thursday, the Pennsylvania health department sought emergency support from the CDC to fight its outbreak, Reuters reported, on the condition that the agency recognize the reported measles deaths.

Why the definition matters

The new approach breaks from the CDC's own practice. During outbreaks in Texas and New Mexico in 2025, the agency counted three measles-associated deaths while they were still under investigation, according to Philly Voice. The University of Minnesota's CIDRAP called the shift a departure from the longstanding practice of accepting states' death determinations.

Part of the reason no standardized definition for measles deaths exists is that dying from measles in the United States was, until recently, extremely rare. Between 2001 and 2022, the country recorded roughly 4,000 measles cases and three deaths. Standard case definitions exist for measles infections but not for measles deaths. Now the definition is being written in the middle of an active count, and applied to a single state's deaths, which public health writers say breeds mistrust.

According to the CDC, 95 percent of this year's measles patients were unvaccinated or had an unknown vaccination status. At a Senate health committee hearing this month, the panel's Republican chairman blamed the Trump administration's approach to vaccines for the recent measles deaths in Pennsylvania, Reuters reported. It is the latest health-policy fight in Washington; GenZ NewZ recently covered the administration's purge of ACA enrollees.

What could settle it

The CDC says it is working with the Council of State and Territorial Epidemiologists on the standardized case definition and will update its reporting as more information becomes available and reviews are completed. HHS told Becker's that any measles-caused deaths will be reported when the National Center for Health Statistics identifies measles as the underlying cause based on death records submitted by the states.

The stakes extend past the spreadsheet. National MMR coverage among kindergartners has fallen from 95.2 percent in the 2019-2020 school year to 92.4 percent in 2025-2026, leaving about two hundred eighty thousand kindergartners at risk, according to CDC kindergarten vaccination coverage data cited by Medical Daily. Community immunity generally requires coverage above that threshold.

Until a definition for measles deaths lands, the country's official record will continue to say what its own states do not: that a record measles year has produced no measles deaths at all. Sources: Becker's Hospital Review, CIDRAP, Philly Voice.