US measles outbreak expands as Pennsylvania cases reach 1,286 and CDC deploys aid
Is it spreading to new areas?
Spread confirmed
As of 19 October 2026, health authorities reported potential exposure sites and active transmission in newly affected areas, including Houston County in Georgia and Chester County in Pennsylvania.
Sources: CBS NewsThe Philadelphia InquirerKey figures
| Figure | Value | Basis | As of | Sources |
|---|---|---|---|---|
| Pennsylvania Total Measles Cases Stated directly by the Pennsylvania Department of Health. | 1,286 | Press reports | Sources: Reuters | |
| US Total Measles Cases Reported by the CDC; a separate ABC News report on 18 October cited a CDC figure of over 900 cases in 24 states. | 4,410 | Official | Sources: ReutersABC News | |
| Pennsylvania Measles-Associated Deaths Confirmed by state health officials and local county coroners. | 6 | Official | Sources: NBC NewsPittsburgh Post-Gazette | |
| Lancaster County Measles Cases Reported by local news outlet LNP without explicit public health agency attribution in the source claim. | 452 | Unverified | Sources: LNP | LancasterOnline |
Who says what
| Who | Says | Date | Sources |
|---|---|---|---|
| Pennsylvania Department of Health | State measles cases have reached 1,286 with six deaths confirmed, while asserting that CDC reporting undercounts state casualties and cases. | Sources: ReutersThe Philadelphia Inquirer | |
| Centers for Disease Control and Prevention (CDC) | National measles cases reached 4,410 across 24 states, and epidemic intelligence personnel have been deployed to assist Pennsylvania state officials. | Sources: LNP | LancasterOnlineReuters | |
| Georgia Department of Public Health | Identified a potential public exposure site at a Houston County restaurant and warned residents of potential infection. | Sources: CBS News | |
| RFK Jr. | Vowed to bring the ongoing Pennsylvania measles outbreak to a quick close. | Sources: Spectrum News |
Summary
As of 19 October 2026, the United States is experiencing its largest measles outbreak since 1991, centered primarily on large outbreaks in Pennsylvania and rural New York State.
The outbreak in Pennsylvania originated in Lebanon County in late April 2026 before expanding statewide, with Lancaster County recording the highest number of local cases. In New York, a state disaster emergency was declared on 5 October 2026 in response to infections spreading through under-immunized rural communities.
Pennsylvania health officials report state cases have risen to 1,286 with six deaths recorded, while CDC officers have arrived in the state to assist local authorities as national case totals top 4,400 across more than 20 states.
Timeline
- Pennsylvania reports its sixth measles-associated death of the year in a Franklin County resident.Sources: NBC NewsCIDRAP
- Minnesota Department of Health identifies 25 cases across central and southeastern counties.Sources: CBS News
- CDC reports national cases reach 4,410 following an 8% weekly increase; Pennsylvania accepts federal aid while criticizing federal tallying.Sources: ReutersThe Philadelphia Inquirer
- Health officials confirm a second measles case on Long Island, New York.Sources: CBS News
- Pennsylvania cases reach 1,286 as a CDC epidemic intelligence officer arrives in the state to support local response efforts.Sources: ReutersLNP | LancasterOnline
- Georgia health officials identify a potential measles exposure site at a restaurant in Houston County.Sources: CBS News
Still unknown
- Discrepancies between CDC national totals and Pennsylvania state death and case counts.
- The full extent of secondary exposures linked to public exposure sites in Georgia and new school cases in Pennsylvania.
- How quickly CDC field deployments in Pennsylvania will impact transmission rates in highly affected areas such as Lancaster and Chester counties.