Pennsylvania's measles outbreak — the worst in the state in years — has passed 1,400 cases. The Pennsylvania Department of Health (DOH) reported on Friday, October 30, that 1,426 cases have now been confirmed across 44 of the state's 67 counties so far in 2026, with 268 people hospitalised and five measles-associated deaths. The Friday tally was 28 cases higher than Wednesday's update, and it keeps Pennsylvania far ahead of every other state: the U.S. Centers for Disease Control and Prevention (CDC) counted 4,852 cases nationwide through October 29, which means nearly three in ten of America's measles cases this year are in Pennsylvania.
Source: 28/22 News (WBRE/WYOU), reporting the DOH Friday update
The department's Friday release, published in Harrisburg, put the newly confirmed cases since its October 28 update at 28, the cumulative hospitalisations at 268 and the confirmed measles-associated deaths at five. It also underlined how concentrated the outbreak is among the unvaccinated: measles cases among vaccinated individuals number just four — less than 1 percent of all cases. Awaaz Punjab last reported this outbreak in October, when the CDC confirmed a third measles death nationally as U.S. cases passed 4,400; Friday's state update is the newest development since then, and the first to take Pennsylvania past 1,400.
Source: Gettysburg Times, reporting the DOH release
Where the cases are: Lancaster far ahead, a central-Pennsylvania cluster behind it
The heaviest burden sits in Lancaster County, which had 487 cases in the department's October 28 county figures, followed by Mifflin County with 198 and Chester County with 93, according to the state data summarised by Outbreak News Today. In northeastern and central Pennsylvania, the department counts 149 cases: 52 in Snyder County, 41 in Clinton County, 19 in Union County, 13 in Northumberland County, seven each in Lycoming and Schuylkill counties, five in Columbia County, four in Montour County and one in Bradford County, WBRE/WYOU reported from the same Friday update. Reporting on the outbreak's history identifies Lebanon County as its original point of origin when it began in late April.
The vaccination picture — and the state's clinic push
Nationally, the CDC says 96 percent of this year's cases are among people who were unvaccinated or whose vaccination status is unknown. Pennsylvania's figures point the same way, with fewer than 1 percent of cases fully vaccinated. The state's response has been built around pop-up vaccination clinics in the affected communities: state health centre staff have administered more than 6,200 MMR vaccinations at 257 pop-up clinics since the outbreak began in late April, and DOH nurses have given more than 10,600 MMR doses in pop-up clinics and state health centres combined in 2026, the department said, with dozens of additional clinics scheduled for the coming weeks and months. Health officials have separately noted that more than 150,000 MMR doses have been administered across the Commonwealth since the beginning of August. The MMR vaccine, given in two doses, provides about 97 percent lifetime protection, the department says.
The Department of Health advises anyone who believes they were exposed to measles and is experiencing symptoms to contact their healthcare provider, or the department's toll-free hotline, before arriving in person. MMR vaccine is available across the state through healthcare providers, county and municipal health departments, DOH state health centres, federally qualified health centres and the Vaccines for Children program.
Pennsylvania is now nearly three in ten of America's cases
The CDC's October 30 release counted 4,852 confirmed U.S. cases through October 29 — 264 more than a week earlier — with 511 hospitalisations, about 11 percent of cases, and 812 cases among children younger than five, according to CDC figures summarised by Reuters. The national total is already more than double the 2,289 cases recorded in all of 2025, with two months of 2026 still to run, and it is the highest since measles was declared eliminated in the United States in 2000. Pennsylvania's 1,426 cases are about 29 percent of that national total.
What is solid
- The Pennsylvania Department of Health's Friday update: 1,426 confirmed cases in 44 counties, 268 hospitalisations, five measles-associated deaths, and only four cases among vaccinated people (less than 1 percent).
- The CDC counted 4,852 U.S. cases through October 29, with 511 hospitalisations and 96 percent of cases among the unvaccinated or those of unknown status.
What is only claimed
- The death counts differ by source and standard: Pennsylvania reports five measles-associated deaths under state criteria, while the CDC has confirmed three measles deaths nationally and has not said where they occurred. Both figures are reported here as their sources state them.
- A possible sixth Pennsylvania death — a 39-year-old woman in Franklin County on October 12 — has been reported by a local coroner's office and remains under formal state investigation to verify whether it meets the state's criteria.
The five people Pennsylvania counts as measles-associated deaths include two infants too young to have received the MMR vaccine — the immunisation schedule recommends the first dose at 12 to 15 months — a 40-year-old woman and an 18-year-old, according to reporting reviewing the state's figures; a fifth death was announced on September 30. All four deaths initially confirmed in the state were among unvaccinated individuals, the same reporting says. The CDC has previously said it would deploy additional support to Pennsylvania to help investigate the outbreak as cases continued to rise.
What happens next: an elimination verdict is due this month
The next milestone is not a case count but a verdict. The Pan American Health Organization, which postponed its measles elimination review from April to November 2026, is expected to deliver its determination this month. Elimination is defined as the interruption of endemic measles transmission for at least 12 consecutive months, alongside high population immunity and a functioning surveillance and response system — a status the United States has held since 2000 and that a year-long outbreak of this size puts directly in question. In the meantime the Department of Health continues its rolling tally — Friday's update was its third of the week — and its pop-up clinic programme continues in the affected counties, with the Lancaster, Mifflin and central-Pennsylvania clusters still adding cases fastest.