Pennsylvania is facing a major measles outbreak in 2026, raising concerns among residents, parents, schools and healthcare professionals. The outbreak has spread across several parts of the state, with Lancaster County among the most affected areas.
According to the latest available reports, Pennsylvania has recorded more than 1,500 confirmed measles cases this year. Health authorities are continuing vaccination campaigns and public health awareness efforts to prevent further infections.
This article covers the latest Pennsylvania measles outbreak updates, affected counties, symptoms, vaccination information and what residents should know.
Pennsylvania Measles Outbreak 2026: Latest Case Numbers
The Pennsylvania Department of Health reported 1,505 confirmed measles cases across 45 counties as of 9 November 2026.
Key reported figures include:
Confirmed cases: 1,505
Affected counties: 45
Hospitalizations: 290
Measles-associated deaths: 6 confirmed by the state
New cases in the previous week: 73
These numbers demonstrate the scale of the outbreak compared with previous years. Pennsylvania recorded only 16 measles cases in 2025 and six in 2024.
Which Counties Are Affected by the Pennsylvania Measles Outbreak?
Lancaster County has been one of the main centres of measles transmission in Pennsylvania.
The outbreak has also spread into other areas, including:
Chester County
Bucks County
Montgomery County
Jefferson County
Mifflin County
Franklin County
Armstrong County
Indiana County
More than half of Pennsylvania's 67 counties have reported cases during 2026.
Bucks County confirmed its first reported case of the year in November. The adult resident had recently travelled to central Pennsylvania and was no longer contagious when the case was announced.
Residents should check local health department notices for the latest exposure locations and updates.
What Is Measles?
Measles is a highly contagious viral infection that spreads through the air when an infected person breathes, coughs or sneezes.
The virus can remain infectious in the air or on surfaces for up to two hours after an infected person leaves an area.
It can affect children and adults, especially those who have not received the recommended measles vaccination.
Measles Symptoms: What Should You Look For?
Measles symptoms generally appear around 7 to 14 days after exposure, although the timing can vary.
Common symptoms include:
High fever
Cough
Runny nose
Red or watery eyes
Sneezing
Small white spots inside the mouth
Red skin rash
The rash usually begins on the face and hairline before spreading down the body.
Anyone who suspects measles should call a healthcare provider before visiting a clinic or hospital to avoid exposing other people.
Why Is the Pennsylvania Measles Outbreak Increasing?
Several factors are contributing to the outbreak.
1. Low Vaccination Rates
Measles spreads rapidly in communities where vaccination coverage is below the level needed for herd protection.
2. Community Transmission
The virus can spread quickly through schools, households, healthcare facilities and other public spaces.
3. Unvaccinated Individuals
Most reported infections have occurred among people who were not vaccinated against measles.
4. Travel Between Communities
People travelling between affected and unaffected communities can contribute to the spread of the virus.
MMR Vaccine: How Can People Protect Themselves?
The measles, mumps and rubella (MMR) vaccine is the most effective protection against measles.
According to the Pennsylvania Department of Health, two doses provide approximately 97% protection against measles.
The standard vaccination schedule includes:
First dose at 12–15 months of age.
Second dose at 4–6 years of age.
Adults who are unsure about their vaccination history should speak with a healthcare professional.
People travelling to areas with active transmission should also check whether they need vaccination.
Measles Outbreak and Pregnant Women
The outbreak has raised particular concern about pregnant women.
Pennsylvania health officials reported that 97 pregnant women had tested positive for measles as of 6 November 2026.
Measles during pregnancy can increase the risk of serious complications, including pregnancy loss, premature birth and low birth weight.
Pregnant women who may have been exposed should contact their healthcare provider immediately. They should not receive the MMR vaccine during pregnancy because it is a live vaccine.
Is Pennsylvania Reporting Measles-Related Deaths?
Yes. The Pennsylvania Department of Health confirmed six measles-associated deaths in 2026 as of its 4 November update.
The deaths were reported in Jefferson, Lancaster and Mifflin counties.
Measles can cause serious complications, including pneumonia and brain inflammation. Young children, pregnant women and people with weakened immune systems are particularly vulnerable.
Pennsylvania Measles Outbreak: What Should Residents Do?
Residents can reduce their risk by following these precautions:
Check whether you and your family are fully vaccinated.
Avoid close contact with anyone suspected of having measles.
Wash your hands regularly.
Monitor public health exposure announcements.
Contact a healthcare professional if symptoms develop.
Call ahead before visiting a healthcare facility if measles is suspected.
Frequently Asked Questions (FAQs)
1. How many measles cases are in Pennsylvania in 2026?
Pennsylvania reported 1,505 confirmed cases across 45 counties as of 9 November 2026.
2. Which Pennsylvania county has the most measles cases?
Lancaster County has been the main centre of the outbreak, with more than 500 reported cases in early November.
3. Is there a measles outbreak in Pennsylvania right now?
Yes. Pennsylvania continues to report community transmission and new infections.
4. What are the first symptoms of measles?
Early symptoms include fever, cough, runny nose and red eyes. A characteristic rash usually develops later.
5. How does measles spread?
Measles spreads through the air when an infected person coughs or sneezes. It is extremely contagious.
6. Is the measles vaccine effective?
Yes. Two doses of the MMR vaccine are approximately 97% effective against measles.
7. How many people have died from measles in Pennsylvania in 2026?
The Pennsylvania Department of Health confirmed six measles-associated deaths as of 4 November 2026.
8. Is measles dangerous for pregnant women?
Yes. Measles during pregnancy can cause serious complications for both the mother and baby.
9. Where can I find official Pennsylvania measles updates?
Residents can check the Pennsylvania Department of Health website and its measles dashboard for updated case numbers and public health notices.
Conclusion
The Pennsylvania measles outbreak has become a major public health concern in 2026, with more than 1,500 confirmed infections across 45 counties.
Vaccination remains the strongest protection against measles. Residents should stay informed, check their vaccination records and follow guidance from local health authorities.