Pennsylvania Requests CDC Emergency Aid as Measles Outbreak Spreads to 42 Counties

Pennsylvania formally requested emergency support, known as an Epi-Aid, from the Centers for Disease Control and Prevention (CDC) in response to a measles outbreak that had spread to 42 counties within the state[8]. By October 19, 2026, Pennsylvania reported 1,286 measles cases[9][10]. The wider United States outbreak had reached 4,588 confirmed cases across 47 jurisdictions by October 22, 2026, marking the most severe measles outbreak in over three decades[1][2][3].

The CDC's involvement signals the growing public health crisis as measles cases continue to rise across the nation. An Epi-Aid request means a state needs specialized federal assistance to investigate and control an outbreak, bringing resources and expertise to affected areas.

What the records show

Pennsylvania's Department of Health made a formal request for CDC Epi-Aid due to the widespread nature of the measles outbreak[8]. The state confirmed 1,286 cases by October 19, affecting residents in 42 of its counties[9][10]. Nationally, the CDC reported 4,588 confirmed measles cases across 47 jurisdictions by October 22[1][2][3]. This total makes 2026 the year with the most severe measles outbreak in the United States in over three decades[1][2][3].

As of October 20, 2026, the CDC confirmed three national measles-related deaths[4][5]. The CDC notes its national death count relies on a verification process involving death certificates through the National Center for Health Statistics[6][17]. In Pennsylvania, five measles-related deaths had been reported by September 30, 2026[7][11][13]. Some subsequent reports indicated the total number of deaths in Pennsylvania reached six by October 13[14][15][16].

The timeline

Pennsylvania reported its first two measles-associated deaths in 35 years in August 2026, both occurring in unvaccinated individuals in Lancaster County[18][19][20][21]. By September 30, the state's death toll from the outbreak reached five[7][11][13]. By October 19, Pennsylvania's confirmed case count hit 1,286 across 42 counties[9][10]. Nationally, confirmed measles cases climbed to 4,588 by October 22, impacting 47 jurisdictions[1][2][3].

What changed and for whom

The formal request for an Epi-Aid from the CDC represents a significant step in Pennsylvania's response to the measles outbreak[8]. This federal support typically involves deploying CDC experts to assist with epidemiological investigations, laboratory testing, and public health interventions. This can affect how quickly the outbreak is contained and how resources are distributed to affected communities and healthcare providers within the state[8].

What we could not confirm

We could not confirm the specific types of resources or personnel the CDC has deployed or plans to deploy to Pennsylvania as part of the Epi-Aid response. The precise dates of CDC personnel arrival or the duration of their deployment were not detailed in the available evidence. We also could not confirm the exact number of measles-related deaths in Pennsylvania that are officially recognized by the CDC's national count, given the differences in reporting between state and federal agencies[6][17].