US measles cases exceed 4,000 as major outbreaks continue in Pennsylvania and New York
Is it spreading to new areas?
Spread confirmed
As of 10 October 2026, health officials and local authorities confirmed active cases and exposures in Allegheny, Chester, and Lancaster counties in Pennsylvania, as well as Ontario and Oswego counties in New York, with suspected cases under investigation in central Minnesota.
Sources: CBS NewsCBS News 2Democrat & ChronicleSyracuse.comLNP | LancasterOnlineKey figures
| Figure | Value | Basis | As of | Sources |
|---|---|---|---|---|
| US total measles cases Reported by the CDC, spanning cases across 45 states. | 4,080 | Official | Sources: U.S. News & World ReportReuters | |
| Pennsylvania total measles cases Confirmed by Pennsylvania health officials; independent media reported state totals exceeded 1,000. | Over 900 | Official | Sources: ABC NewsSpectrum News | |
| Chester County, PA measles cases Reported by The Philadelphia Inquirer. | 86 | Press reports | Sources: The Philadelphia Inquirer | |
| Ontario County, NY measles cases Reported by Ontario County officials. | 4 | Official | Sources: Democrat & Chronicle |
Who says what
| Who | Says | Date | Sources |
|---|---|---|---|
| Centers for Disease Control and Prevention (CDC) | Announced $100 million in federal assistance for state health departments, confirmed national cases exceeded 4,080 across 45 states, and warned of additional spread during the travel season. | Sources: CBS NewsABC NewsU.S. News & World ReportThe New York TimesABC News 2 | |
| Pennsylvania Health Department and Governor Josh Shapiro | Reported 74 new cases in a single day, stated the outbreak shows no sign of slowing, and engaged in public debate with federal officials over measles-associated deaths. | Sources: ABC NewsABC News 2NBC NewsABC News 3 | |
| New York State Officials | Declared a state disaster emergency due to surging cases, mobilized public health resources, and sought federal aid. | Sources: WSKGReutersNBC 4 New YorkSpectrum News | |
| HHS Secretary Robert F. Kennedy Jr. | Offered federal support to New York State and debated Pennsylvania's governor regarding measles-associated deaths. | Sources: U.S. News & World ReportABC News |
Summary
As of 11 October 2026, the United States is responding to its largest measles year since 1991, with national confirmed cases surpassing 4,000 across 45 states according to the Centers for Disease Control and Prevention. The nationwide surge is driven primarily by sustained outbreaks in Pennsylvania and rural New York State.
Pennsylvania accounts for more than a quarter of all national cases, exceeding 1,000 total cases as health officials report new school-linked infections in Allegheny, Chester, and Lancaster counties, leading to school closures and contact quarantines. State health officials noted the outbreak shows no sign of slowing after logging 74 new cases in a single day.
In New York State, where a state disaster emergency was declared following heavy concentration in the Southern Tier and Finger Lakes regions, cases continue to be identified in counties including Ontario and Oswego. Federal authorities have offered $100 million in emergency funding to state health departments as state and federal leaders adopt differing public health strategies.
Timeline
- New York State declared a state disaster emergency due to rising measles cases while the CDC warned of further transmission ahead of travel season.Sources: NBC 4 New YorkABC News
- Pennsylvania confirmed cases passed 900, while HHS offered federal assistance to New York State.Sources: ABC NewsU.S. News & World Report
- Pennsylvania reported 74 new cases in a single day, the CDC offered $100 million to state health departments, and local authorities in NY reported cases in Ontario and Oswego counties.Sources: ABC NewsThe New York TimesDemocrat & ChronicleSyracuse.com
- CDC confirmed US measles cases reached 4,080 across 45 states, and Oxford Area High School in Pennsylvania closed following a confirmed case.Sources: U.S. News & World Report6abc Philadelphia
- Allegheny County health officials linked a second measles case to a local school, while central Minnesota reported suspected cases.Sources: CBS NewsCBS News 2
- Reporting detailed differing public health strategies implemented by New York and Pennsylvania state leaders.Sources: Politico
Still unknown
- Whether suspected cases reported in central Minnesota will be officially confirmed as measles.
- The total number of secondary exposures and infections resulting from cases identified at schools in Chester, Allegheny, and Lancaster counties.
- How rapidly the $100 million in CDC emergency federal support will be distributed and utilized by state health departments.
- The official toll and verification of measles-associated hospitalizations and deaths during the multi-state outbreak.