Pennsylvania's Fifth Measles Death Signals Preventable Crisis

Pennsylvania health officials said on Wednesday that a Lancaster County resident had died after contracting measles, raising the state's death toll from the disease this year to five. The person was unvaccinated, the Pennsylvania Department of Health said, and the department will release no further details that could identify them. These are the first measles-associated deaths reported in the state in more than three decades, according to the Associated Press.

The pattern behind the four earlier deaths is the same. Two infants in Lancaster County died in August, the first measles deaths in the United States this year. An 18-year-old resident of Mifflin County died of acute disseminated encephalomyelitis, a rare neurological complication of the virus. A 40-year-old woman from Jefferson County died in mid-September. None of them were vaccinated, the state health department said. The two infants were too young to receive the vaccine under current recommendations.

Pennsylvania is carrying the heaviest share of the nation's measles resurgence. The state's outbreak, which began in April, has grown to 943 cases across 39 counties, with at least 176 hospitalizations. All but four of those cases have been among people who were not fully vaccinated, reported by CNN. Lancaster County alone accounts for about two-fifths of the state's cases.

The worst measles year in 35 years

The outbreak is on track to become the largest the United States has seen in decades. The Associated Press described 2026 as the country's worst year for the disease since 1991. The Centers for Disease Control and Prevention confirmed 3,659 measles cases nationally as of September 24, a total 60 percent higher than all of 2025, which had 2,289 cases and three deaths, reported by Reuters. The agency says forty new outbreaks have emerged this year, and roughly 95 percent of patients were unvaccinated or had unknown vaccination status.

The United States eliminated the domestic spread of measles in 2000 by keeping vaccination rates high. That protection has slipped. Coverage has fallen short of the level needed to stop outbreaks, and infections have surged in recent years. The virus now travels easily through communities where immunization has lapsed, and Pennsylvania's agricultural counties, where the outbreak has concentrated, show how fast it moves once it arrives.

Why the death counts don't match

How many people measles has killed this year depends on who is counting. Pennsylvania's health department counts a death as measles-associated when it occurs within 30 days of symptom onset and a positive test. By that definition, the state has five deaths, all reported to the CDC.

The CDC's national dashboard counts two. The agency shifted this year to using mortality data from the National Center for Health Statistics rather than relying on state health departments, and it is working with the Council of State and Territorial Epidemiologists to build a standard national definition for measles deaths. The change has drawn scrutiny and opened a public dispute between Pennsylvania Governor Josh Shapiro and Health Secretary Robert F. Kennedy Jr. over how the deaths are defined, reported by Reuters.

"Every one of these deaths was preventable," said Amesh Adalja, a senior scholar at the Johns Hopkins Center for Health Security, noting that only four of the state's cases have involved vaccinated people. Adalja warned that the gap between the state and federal tallies is its own public health problem: "To the public, that gap looks like either incompetence or concealment."

The Department of Health and Human Services said in a statement that officials were "deeply saddened to hear of another death in Pennsylvania." Pennsylvania has not made a formal request for federal help, the department added, but the CDC stands ready to deploy epidemiologists to support the state's identified needs if asked, reported by Reuters.

The protection against all of this is well established. The measles, mumps and rubella vaccine is among the most effective tools in medicine: one dose is 93 percent effective against measles, and the recommended second dose raises protection to 97 percent, with immunity lasting a lifetime, according to the American Academy of Pediatrics. In November, international health officials will meet to determine whether the United States and Mexico have lost their measles-free status, according to the Associated Press.

Further reporting: Reuters: Pennsylvania reports fifth measles-associated death; AP: Pennsylvania records 5th measles death; CNN: Pennsylvania tallies a fifth measles death.