Measles Surge in the US Reaches 35-Year High as CDC Confirms Two Deaths

The United States has recorded its worst measles outbreak in more than three decades, with federal health officials confirming 3,659 cases so far this year — the highest annual total since 1991. The Centers for Disease Control and Prevention (CDC) also confirmed on Tuesday that two deaths have been linked to the disease, though the agency did not disclose which states the fatalities occurred in.

The figures mark a striking reversal for a country that declared measles eliminated in 2000, a status achieved through decades of widespread vaccination. The disease's resurgence has alarmed public health specialists, who point to declining immunization rates and growing skepticism toward vaccines as key drivers of the spread.

Pennsylvania has emerged as the epicenter of the current outbreak, reporting more than 900 cases — roughly a quarter of the national total. The state's high caseload has made it a focal point in an increasingly bitter dispute over how measles deaths are counted and reported at the federal level.

That dispute escalated into a public feud between Pennsylvania Governor Josh Shapiro and Health and Human Services Secretary Robert F. Kennedy Jr. after state officials reported four measles-related deaths this year, only to see the CDC omit them from its national tally. Kennedy has insisted that just one of those deaths could be directly attributed to measles, while state authorities maintain their count is accurate. The disagreement has raised uncomfortable questions about the reliability of the country's official death statistics at a moment when public confidence in health agencies is already strained.

Critics have directed much of their ire at the messaging coming from the highest levels of the US government. President Donald Trump and Secretary Kennedy have both faced sharp criticism for amplifying debunked claims that link vaccines to autism — a theory long rejected by the global scientific community. Public health experts warn that such statements, coming from senior officials, risk deepening vaccine hesitancy at precisely the moment when immunization coverage needs to be strengthened.

The CDC's ability to respond to the outbreak has been complicated by significant institutional disruption. The agency has lost nearly 30 percent of its workforce following sweeping federal layoffs that began after Trump's inauguration in January 2025, compounded by a wave of voluntary retirements and resignations. The staffing shortfall has raised concerns about the agency's capacity to track cases, coordinate with states, and communicate effectively with the public during a fast-moving health crisis.

In August, Trump signed an executive order that would push states to revise their childhood vaccine recommendations. The order calls for splitting the combined measles, mumps and rubella (MMR) vaccine into three separate shots and spacing out childhood appointments over a longer period. Public health experts immediately warned that the plan would increase infection risks by requiring families to make additional return visits to clinics, creating more opportunities for children to fall behind on their immunizations.

The order took effect despite decades of global evidence demonstrating that combination vaccines are safe and effective. The World Health Organization has also pushed back against the proposal, with its chief stating that the approach contradicts years of accumulated scientific research on vaccine safety and efficacy.

Another source of controversy has been the CDC's recent decision to change how it compiles its national measles death count. The agency has shifted from rapid, real-time reporting by state health departments to using mortality data from the National Center for Health Statistics. Officials say the change is intended to ensure consistency, but it has sparked intense pushback from state officials and health experts who argue that the new system introduces delays and may undercount fatalities during an active outbreak.

The CDC has defended the transition, saying it is working closely with state epidemiologists to develop a standardized definition of what constitutes a measles-related death. The agency has also cautioned that its death toll is provisional and subject to revision as additional information becomes available and case reviews are completed.

The current outbreak represents a dramatic setback for a nation that once served as a global model for measles elimination. Measles is among the most contagious infectious diseases known to science, capable of spreading through the air and infecting up to 90 percent of unvaccinated people exposed to it. Complications can include pneumonia, encephalitis, and in severe cases, death — particularly among infants, young children, and immunocompromised individuals.

Health officials say the path forward depends largely on restoring public trust in vaccination and rebuilding the institutional capacity needed to monitor and contain outbreaks. With cases still climbing and the national death count now a subject of political dispute, the coming months will test whether the country can reverse a trend that many experts believe was entirely preventable.