US Measles Cases Reach 35-Year Peak as CDC Confirms Two Deaths Amid Tracking Dispute

The United States has recorded 3,659 confirmed measles cases this year, the highest annual total in 35 years, according to figures released by the Centers for Disease Control and Prevention. Alongside the surge in infections, the federal agency confirmed on Tuesday that two deaths have been linked to the disease, though it did not identify which states the fatalities occurred in.

Pennsylvania has emerged as the epicentre of the nationwide outbreak, reporting more than 900 cases — by far the largest share of any state. The state's caseload has made it a focal point in a broader national argument over how measles deaths are counted and reported, a dispute that has pitted state officials against the federal health apparatus.

Measles was declared eliminated in the United States in 2000, a milestone that followed decades of widespread vaccination. That status has effectively unravelled in recent years as the disease staged an aggressive comeback. Public health analysts have repeatedly connected the resurgence to growing vaccine scepticism, a trend that has deepened despite overwhelming scientific consensus on the safety and effectiveness of immunisation.

The political climate around vaccines has drawn intense scrutiny. Members of President Donald Trump's administration, including Health and Human Services Secretary Robert F. Kennedy Jr. and the president himself, have faced criticism for amplifying debunked claims that link vaccines to autism and for making other statements that contradict established medical evidence. Critics argue that such messaging has eroded public confidence at precisely the moment when robust uptake of the measles, mumps and rubella vaccine is most needed.

The question of how many people have died from measles has itself become a source of open conflict. Pennsylvania reported four measles-related deaths this year, but the CDC did not include those fatalities in its national tally. Kennedy has insisted that only one of the four deaths was actually caused by measles. The discrepancy triggered a public feud between Pennsylvania Governor Josh Shapiro and the health secretary, exposing deep disagreements over methodology and jurisdiction.

Adding to the confusion, the CDC recently changed the way it compiles its national measles death count. The agency shifted to using mortality data from the National Center for Health Statistics, moving away from the rapid, real-time reporting it had previously relied on from state health departments. The change has generated intense pushback from state officials and epidemiologists who say it delays transparency and obscures the true scale of the outbreak.

Federal officials have defended the shift, explaining that they are working with state epidemiologists to develop a standard definition of what constitutes a measles-related death, with the goal of ensuring consistent reporting across all jurisdictions. The agency has also cautioned that its death toll remains subject to revision as further information is gathered and case reviews are finalised — a caveat that has done little to quiet the criticism.

The CDC's capacity to manage the crisis has been called into question after the agency lost nearly 30 percent of its workforce. The staffing shortfall stems from sweeping federal layoffs that followed Trump's inauguration in January 2025, compounded by a wave of voluntary retirements and resignations. The departures have left the agency operating with fewer personnel as it confronts its most serious measles outbreak in a generation.

In August, the president signed an executive order directed at changing childhood vaccine recommendations across the states. The order calls for splitting the MMR vaccine into three separate shots and spacing out childhood appointments over a longer period. Public health experts warned that the plan would increase infection risks by requiring families to make additional return visits to clinics and doctors' offices, creating more opportunities for missed doses.

The executive order took effect despite decades of global evidence demonstrating that combination vaccines are safe and effective. The World Health Organization's chief was among those who publicly criticised the Trump administration's vaccine push, saying it runs counter to years of accumulated scientific evidence. The episode has intensified concerns among health professionals that policy is being shaped by ideology rather than data.

The outbreak's trajectory carries significant implications beyond the current case count. Measles is among the most contagious infectious diseases known to medicine, and maintaining elimination status requires sustained high vaccination coverage across communities. When coverage dips, outbreaks can spread rapidly through schools, workplaces and other gathering places, placing particular risk on infants, pregnant women and people with compromised immune systems.

The dispute over death tracking also has consequences for public understanding. When state and federal figures diverge, experts warn that confidence in official data can erode, making it harder for health authorities to communicate risk and mobilise an effective response. The disagreement between Pennsylvania and the CDC has become a case study in how political friction and methodological disagreements can complicate outbreak management at the highest levels.

For now, the CDC's numbers stand as the national benchmark: 3,659 cases and two confirmed deaths this year, with the agency noting that the figures could change as reviews conclude. Behind those figures lies a country grappling with the erosion of a public health achievement once considered secure, and an ongoing argument over how to count the cost of its reversal.