US measles cases pass 4,000 as Pennsylvania outbreak reaches 1,222 cases
Is it spreading to new areas?
Spread confirmed
As of 15 October 2026, state and local health officials reported new measles cases spreading into Montgomery County, Allegheny County, and a linked case in Georgia.
Sources: Times UnionCBS NewsCBS News 2Key figures
| Figure | Value | Basis | As of | Sources |
|---|---|---|---|---|
| Pennsylvania Confirmed Cases Reported by Pennsylvania state health officials | 1,222 | Official | Sources: WHYYU.S. News & World ReportReuters | |
| Pennsylvania Measles Deaths Reported by Pennsylvania health officials and county coroners | 6 | Official | Sources: NBC NewsReutersAxios | |
| US National Cases Reported by the Centers for Disease Control and Prevention (CDC) | 4,080 | Official | Sources: U.S. News & World ReportReuters |
Who says what
| Who | Says | Date | Sources |
|---|---|---|---|
| Centers for Disease Control and Prevention (CDC) | Deployed an epidemiologist and additional support to Pennsylvania at the state's request to investigate and respond to the outbreak. | Sources: NBC NewsThe Philadelphia InquirerReuters | |
| RFK Jr. | Vowed to bring the Pennsylvania measles outbreak to a quick close. | Sources: Spectrum News | |
| Pennsylvania Health Officials | Confirmed 1,222 total cases and six deaths in the statewide outbreak while conducting contact tracing across expanding counties. | Sources: U.S. News & World ReportNBC NewsPennLive | |
| Chester County Health Department | Issued exposure warnings and directed local school officials to verify staff vaccination status following confirmed cases. | Sources: The Philadelphia Inquirer6abc Philadelphia |
Summary
As of 15 October 2026, the nationwide measles outbreak continues to expand, driven primarily by a major outbreak in Pennsylvania where confirmed cases have reached 1,222. The Centers for Disease Control and Prevention (CDC) has deployed a disease detective to assist Pennsylvania public health officials with investigation and outbreak control.
Pennsylvania has recorded six measles-associated deaths during the current outbreak, including a recent fatality involving a 39-year-old woman in Franklin County. Cases and potential exposure sites continue to pop up across multiple counties, prompting school closures and quarantine measures.
Nationally, total reported measles cases in the United States have surpassed 4,000 across 45 states, making 2026 the highest year for US measles cases since 1991. Public health authorities note increasing interest in vaccination as response efforts scale up.
Timeline
- The CDC reports that total US measles cases in 2026 have reached 4,080 across 45 states.Sources: U.S. News & World ReportABC News
- Franklin County coroner reports Pennsylvania's sixth measles-associated death, involving a 39-year-old woman.Sources: CIDRAPThe Philadelphia Inquirer
- Georgia health officials announce a new measles case that may be connected to the ongoing Pennsylvania outbreak.Sources: CBS News
- Pennsylvania health officials announce state measles total has surpassed 1,200, reaching 1,222 cases.Sources: U.S. News & World ReportReuters
- CDC sends a disease detective to Pennsylvania to assist with the response, while four new cases are reported in Montgomery County.Sources: NBC NewsTimes Union
Still unknown
- Whether the newly identified measles case in Georgia is definitively connected to the Pennsylvania outbreak strain.
- The full scope of ongoing transmission in recently affected areas such as Montgomery and Allegheny counties.
- The specific measures federal epidemiologists from the CDC will implement to curb transmission in Pennsylvania.