US measles cases exceed 4,400 as Pennsylvania outbreak reaches 1,317 cases
Is it spreading to new areas?
Spread confirmed
As of 21 October 2026, health officials reported new cases and exposure locations in DuPage County, Illinois and Houston County, Georgia.
Sources: CBS NewsCBS News 2Key figures
| Figure | Value | Basis | As of | Sources |
|---|---|---|---|---|
| Pennsylvania Confirmed Cases Reported by the Pennsylvania Department of Health. | 1,317 | Press reports | Sources: Reuters | |
| US Confirmed Cases Reported by the Centers for Disease Control and Prevention. | 4,410 | Official | Sources: ReutersCIDRAP | |
| US Measles Deaths (CDC Count) Confirmed by the Centers for Disease Control and Prevention. | 3 | Official | Sources: Fox News | |
| Pennsylvania Measles Deaths Confirmed by Pennsylvania health officials, who accused the CDC of undercounting state deaths. | 5 | Official | Sources: The Philadelphia Inquirer | |
| Lancaster County PA Confirmed Cases Reported by LNP | LancasterOnline without direct health department attribution. | 452 | Unverified | Sources: LNP | LancasterOnline |
Who says what
| Who | Says | Date | Sources |
|---|---|---|---|
| Pennsylvania Department of Health | Confirmed 1,317 state cases, warned of congenital measles risks during pregnancy, and accused the CDC of undercounting state deaths. | Sources: ReutersThe HillThe Philadelphia Inquirer | |
| Centers for Disease Control and Prevention (CDC) | Confirmed 4,410 national cases and three US deaths, and sent an epidemic intelligence officer to assist Pennsylvania. | Sources: Fox NewsReutersWGAL | |
| DuPage County Health Officials | Reported the county's first measles case of 2026 with potential exposure at Chicago O'Hare International Airport. | Sources: CBS News | |
| RFK Jr. | Vowed to bring the Pennsylvania measles outbreak to a quick close. | Sources: Spectrum News |
Summary
As of 21 October 2026, total confirmed measles cases in Pennsylvania reached 1,317, while national counts exceeded 4,400 across 24 states in the largest US outbreak year since 1991. The state outbreak began in Lebanon County in late April 2026 and spread statewide, with Lancaster County recording the highest local totals.
Pennsylvania health officials warned doctors and pregnant women regarding rising risks of congenital measles and infections during pregnancy. The CDC confirmed three national measles-related deaths, while Pennsylvania health authorities reported five deaths in the state and criticized federal counts for undercounting.
Federal response efforts escalated as a CDC epidemic intelligence officer arrived in Pennsylvania to assist local investigators. Meanwhile, new cases and potential exposures were reported in Illinois, Georgia, Minnesota, and New York.
Timeline
- Minnesota reported 25 measles cases in central and southeastern regions, while RFK Jr. pledged to resolve the Pennsylvania outbreak.Sources: CBS NewsSpectrum News
- US measles cases reached 4,410, and Pennsylvania health officials confirmed five state deaths while accusing the CDC of undercounting.Sources: ReutersThe Philadelphia Inquirer
- A CDC epidemic intelligence officer arrived in Pennsylvania as state cases reached 1,286, and Georgia reported exposure in Houston County.Sources: LNP | LancasterOnlineReutersCBS News
- Pennsylvania health officials issued warnings regarding congenital measles risks and measles infections during pregnancy.Sources: NBC NewsCIDRAP
- Pennsylvania reported 1,317 confirmed cases, Illinois reported a case linked to O'Hare Airport, and the CDC confirmed a third national death.Sources: ReutersCBS NewsFox News
Still unknown
- Why the CDC's national death total does not reflect the higher death count reported by Pennsylvania state health officials.
- Whether the CDC will act on state health department requests to validate a new diagnostic test for measles.
- The full extent of congenital measles cases and pregnancy-related complications arising from the outbreak in Pennsylvania.