US measles cases exceed 4,400 as Pennsylvania total reaches 1,317
Is it spreading to new areas?
Spread confirmed
As of 22 October 2026, health authorities confirmed new cases and exposure locations across multiple states, including new clusters in Minnesota and a first case of the year in DuPage County, Illinois.
Sources: CIDRAPCBS NewsCBS News 2Key figures
| Figure | Value | Basis | As of | Sources |
|---|---|---|---|---|
| Pennsylvania Confirmed Cases Stated by the Pennsylvania Department of Health | 1,317 | Press reports | Sources: ReutersU.S. News & World Report | |
| United States Total Cases Stated by CDC and reported by health officials; another CDC tally on Oct 18 cited over 900 cases in 24 states | 4,410 | Official | Sources: CIDRAPReutersABC News | |
| Measles Deaths Discrepancy CDC confirmed 3 national deaths, while Pennsylvania health officials confirmed 5 state deaths (local news reported 6) | 3 nationwide (CDC) / 5 to 6 in PA | Official | Sources: Fox NewsThe Philadelphia InquirerFOX 29 Philadelphia | |
| Lancaster County PA Cases Reported by LNP following the county's largest weekly increase since September | 452 | Press reports | Sources: LNP | LancasterOnline |
Who says what
| Who | Says | Date | Sources |
|---|---|---|---|
| Pennsylvania Department of Health | Reported 1,317 total cases, issued alerts on congenital measles risks for pregnant women, and criticized the CDC for excluding state deaths from national counts. | Sources: 6abc PhiladelphiaReutersThe Philadelphia Inquirer | |
| Centers for Disease Control and Prevention (CDC) | Dispatched disease investigators to Pennsylvania and confirmed 3 national measles deaths, while declining to approve or validate high-volume test requests from states. | Sources: The GuardianCBS NewsFox News | |
| Public Health Experts | Expressed concern regarding decreased transparency at the CDC as national measles deaths increase. | Sources: The GuardianU.S. News & World Report |
Summary
As of 22 October 2026, the United States is facing its largest measles outbreak in decades, with national case totals exceeding 4,400 and Pennsylvania reporting 1,317 confirmed infections. Pennsylvania health officials have issued alerts for pregnant women regarding congenital measles risks, noting that adults account for two-thirds of the state's cases.
Tensions have emerged between federal and state health officials over the official response. Pennsylvania officials accused the CDC of undercounting measles deaths after the federal agency confirmed 3 national deaths while Pennsylvania alone recorded at least 5 deaths. State departments also reported waiting months for CDC assistance with faster high-volume testing.
Timeline
- National measles cases reach 4,410 while Pennsylvania exceeds 1,200 cases and confirms 5 outbreak deaths.Sources: ReutersThe Philadelphia Inquirer
- Pennsylvania cases rise to 1,286 as a CDC epidemic intelligence officer arrives to assist state health workers.Sources: ReutersLNP | LancasterOnline
- Pennsylvania total cases reach 1,317; CDC confirms a third national death, while DuPage County, Illinois reports its first case of 2026.Sources: ReutersFox NewsCBS News
- Pennsylvania health officials issue alert on congenital measles for pregnant women; reports reveal CDC denied approval for a high-volume measles test.Sources: 6abc PhiladelphiaThe Guardian
Still unknown
- Why the CDC has omitted Pennsylvania's confirmed state deaths from the official federal tally.
- Whether the CDC will assist state laboratories in validating high-volume measles tests to relieve diagnostic delays.
- The scale of newly reported measles clusters in Minnesota and potential exposures linked to travel hubs.