Pennsylvania is seeking emergency assistance from the US Centers for Disease Control and Prevention as a major measles outbreak spreads across the state, and has warned the request could be withdrawn unless the federal agency publicly recognizes the four measles-associated deaths reported there. The Pennsylvania department of health has begun the process of requesting CDC emergency support known as an Epi-Aid, according to a letter reviewed by the Guardian. Reuters first reported the letter on Thursday, describing the state's request as landing squarely in the middle of the dispute between the state and the US health secretary. Debra Bogen, the state's secretary of health, outlined the condition in a letter sent Wednesday to the CDC director, Erica Schwartz. "The CDC's choice not to publicly recognize the deaths undermines our response," Bogen wrote. "For this reason, if CDC is unable to transparently and accurately communicate information about those measles-associated deaths, the department will respectfully rescind our request for a CDC Epi-Aid." An Epi-Aid is one of the CDC's most direct intervention tools: the agency dispatches its own disease detectives to work alongside state epidemiologists, tracing contacts, assessing vaccination coverage and advising local health departments. Pennsylvania is now offering to invite that machinery in — while openly threatening to send it home over a matter of public accounting. ## A State-Federal Dispute Over Counting the Dead The development comes amid an ongoing dispute involving Josh Shapiro, the state's Democratic governor, and Robert F Kennedy Jr, the US health secretary, over the state's handling of the outbreak and how measles-related deaths are being counted. Kennedy has questioned whether deaths linked to the measles outbreaks since he took office were caused by the virus or by another condition. He also instructed the CDC not to include Pennsylvania's reported fatalities in the national measles death count last month, a move health experts called highly unusual and warned could lead the public to underestimate the dangers of measles. Kennedy, meanwhile, has accused Shapiro of politicizing Pennsylvania's outbreak and failing to seek out federal assistance. The accusation of failing to seek federal assistance now sits awkwardly against the state's formal request. Pennsylvania's latest move marks a clear shift from its earlier position: state health officials had previously resisted CDC assistance, saying they were capable of managing the outbreak without federal help. Since then, the situation has worsened. ## How the Outbreak Escalated The toll has mounted across the month. The state reported its third measles death in mid-September, according to the Guardian's earlier reporting on the outbreak. A further death followed within days, and by Tuesday the state's count of measles-related fatalities stood at four. On Wednesday, the same day Bogen's letter was sent, the Pennsylvania health department announced that 731 measles cases have been confirmed in 38 counties across the state so far this year. The outbreak is among the largest and deadliest in the country. It comes as the US experiences its most severe measles resurgence in more than three decades, driven by increasing vaccine hesitancy. With US measles deaths on the rise nationally, local officials are stepping into roles the federal health leadership has retreated from, as the Guardian has documented in its coverage of the outbreak. The federal government has also changed how it counts the dead. This month it was revealed that the Trump administration altered the way measles deaths are tallied amid the Pennsylvania outbreak. The CDC is now using data from the National Center for Health Statistics, a system designed to track mortality trends over time rather than count outbreak deaths in real time. It remains unclear why the change was made. ## Congress Enters the Fight On Wednesday, Bill Cassidy, the Republican chair of the Senate health committee, blamed the Trump administration's vaccine-skeptical approach for the recent measles deaths in Pennsylvania. His intervention places the dispute squarely before Congress as the outbreak accelerates. The collision of a fast-growing outbreak with a federal death-counting dispute leaves Pennsylvania's request in uncharted territory. The state has asked for the CDC's epidemiological muscle while simultaneously conditioning the request on the agency's willingness to say publicly that four people died. No previous outbreak of this scale has unfolded against a comparable standoff between a state health department and its own federal counterpart. The dispute has also become personal between the two offices. Kennedy's accusation that Shapiro politicized the outbreak preceded the governor's health department formally asking the secretary's agency for help — a request that itself doubles as a public challenge. The CDC did not immediately respond to the Guardian's request for comment. Until it does, Pennsylvania's 731 patients across 38 affected counties remain the clearest measure of an outbreak that state officials say can no longer be managed alone, and the standoff over four deaths now shapes how the federal government will weigh in. The state's ultimatum is unambiguous: recognition first, assistance second.