Pennsylvania’s measles outbreak is statewide: the Pennsylvania Department of Health has confirmed 1,317 cases across 44 counties as of October 21, 2026, according to the Pennsylvania Chapter of the American Academy of Pediatrics. For the live county picture, use the Pennsylvania Department of Health’s measles dashboard, and contact a clinician promptly if you think you were exposed or have symptoms.
The numbers have changed quickly. The most useful immediate question is not whether every reported case is near you, but whether you or your child has been exposed, has symptoms, or needs help confirming MMR vaccination records.
Latest update: the count and the Amish community
The most recent official total in this guide is 1,317 confirmed cases across 44 counties as of October 21, 2026, as reported by the Pennsylvania Chapter of the American Academy of Pediatrics. The state’s totals change from day to day, and the Pennsylvania Department of Health measles dashboard carries the newest figures, so check it for today’s number.
The outbreak has hit Pennsylvania’s Amish community hard. CIDRAP reports that many Amish families prefer to care for sick children at home rather than take them to a pediatrician, which means milder cases can go uncounted. Paul Offit, director of the Vaccine Education Center at Children’s Hospital of Philadelphia, told CIDRAP that “not everyone with measles goes to the doctor.”
On vaccination, the state’s October 2 update says state health centers had given more than 5,600 MMR vaccinations at 189 pop-up clinics in the affected communities since late April. The same update does not break out vaccination figures for the Amish community specifically.
One open question: the Guardian reported on September 30 that the CDC’s national tally had not counted Pennsylvania’s measles deaths, while the state counts five confirmed measles-associated deaths under its own definition.
How bad is the measles outbreak in Pennsylvania right now?
As of October 21, 2026, PA AAP reported 1,317 confirmed cases in 44 counties and five measles-associated deaths. Earlier state reporting on October 2 counted 977 cases in 39 counties, 195 hospitalizations, five deaths, and four cases among vaccinated people. That change shows why the dashboard is the place to check the current total rather than relying on a single news update.
The Pennsylvania Department of Health says measles spreads easily from person to person and that people can spread it from four days before through four days after the rash appears. The virus can remain in an airspace for up to two hours after an infected person leaves.
Where is measles in Pennsylvania?
The outbreak is not confined to one county. PA AAP’s October 21 update puts cases in 44 counties. The state dashboard is the practical map for checking county-level totals and updates; it notes that different sections can refresh at slightly different times.
Lancaster County has been a major focus: CIDRAP reported 391 Lancaster cases when the statewide total was 977, followed at that time by Mifflin, Chester, Jefferson, and Snyder counties. Those county figures are a snapshot, not a current ranking.
Which state has the most measles cases?
Pennsylvania was the state with the highest 2026 total in CIDRAP’s October 2 report, when it had 977 confirmed cases. The state total later rose above 1,300, so Pennsylvania remains the central outbreak readers are tracking in the information available as of October 2026.
Which Pennsylvania counties have the most measles cases?
The state’s October 2 update, when the statewide total was 977, put these counties at the top, according to CIDRAP:
| County | Cases in the October 2 update |
|---|---|
| Lancaster | 391 |
| Mifflin | 117 |
| Chester | 83 |
| Jefferson | 44 |
| Snyder | 41 |
Lancaster has by far the most. The Guardian reported that agricultural communities in Lancaster and Mifflin counties have remained at the center of the outbreak. Chester County, which people often search by name, was third in that update. Because the outbreak has since reached 44 counties, check the state dashboard for current county totals.
What are the first signs of measles?
Fever, cough, runny nose, and red, watery eyes can come before the rash. The Pennsylvania Department of Health says the rash typically follows a few days later, beginning on the head and moving downward. Symptoms can begin 7 to 21 days after exposure.
If you think you were exposed and develop symptoms, call a health care provider or Pennsylvania’s 877-PA-HEALTH hotline before arriving for care. The state specifically asks people with a suspected case to contact a provider and says health care teams should manage complications and supportive care; it says there is no specific measles treatment.
Can vaccinated children or adults still get measles?
Yes, but vaccination is the strongest protection described by the state. Pennsylvania’s October 2 update recorded four vaccinated people among 977 reported cases, fewer than 1% of that total. The Department of Health says two MMR or MMRV doses provide the best protection and that most vaccinated people are protected for life. The Pennsylvania Department of Health says MMR vaccination provides the best protection against measles; see the CDC’s MMR vaccine guidance.
For someone vaccinated decades ago, the practical starting point is their record. The state says people with two documented MMR doses do not need another dose. Adults with one dose or no available record should discuss their situation with a health care provider or pharmacist rather than guessing.
Can I get measles if I was vaccinated 40 years ago?
It is possible, and your records decide most of the answer. The CDC says most people vaccinated with MMR or MMRV are protected for life. Some vaccinated people can still get measles, either because their immune response was weaker than expected or because their ability to fight the infection decreased over time. Even then, their symptoms are generally milder and they are less likely to spread the disease.
The CDC gives specific rules for older shots. If you have documentation of live measles vaccine received in the 1960s, you do not need to be revaccinated. People vaccinated before 1968 with killed vaccine, or with a vaccine of unknown type, should be revaccinated. People born before 1957 are presumed protected because nearly everyone born then was infected naturally.
If you cannot find your records, the CDC says there is no harm in getting another dose if you may already be immune. Pennsylvania’s state update adds that people with two documented MMR doses do not need another, and adults with one dose or no record should talk with a health care provider or pharmacist.
What are the real options after an exposure or when records are unclear?
| Situation | What the state says | What to do next |
|---|---|---|
| Symptoms or possible exposure | Contact a provider; measles has no specific treatment, and providers manage complications and supportive care. | Call ahead before going in. |
| Two documented MMR doses | The October 2 state update says another dose is not needed. | Keep records available if requested. |
| One dose or no record | The state says to speak with a provider or pharmacist about vaccination. | Ask them to review your individual record and exposure situation. |
| Child who is uninsured, underinsured, or has Medicaid | The Department of Health says eligible children 18 and under can receive MMR at no cost at its 59 state health centers. | Contact a state health center, local health department, or care provider. |
Most private and commercial insurance plans cover MMR at no cost, according to the Pennsylvania Department of Health, though it says to confirm coverage with the insurer. MMR is also available through pediatric and primary-care offices, pharmacies, community health centers, county or municipal health departments, and the Vaccines for Children program.
Is the MMR vaccine safe, and why are some parents hesitant?
The CDC describes the MMR vaccine as very safe. Its side effects are usually mild and go away on their own. Most people have none.
| Side effect | What the CDC says |
|---|---|
| Soreness, redness or swelling where the shot was given | Usually mild |
| Fever, mild rash, temporary joint pain or stiffness | Usually mild |
| High fever that could cause a seizure | Described as rare |
The CDC states that scientists in the United States and other countries have carefully studied the MMR vaccine and none have found a link between it and autism.
CIDRAP reports that kindergarten MMR coverage fell from 95.2% in the 2019–20 school year to 92.5% in 2024–25, with much lower levels in certain communities. Communities need to vaccinate about 95% of children to prevent outbreaks. Families give many different reasons for hesitating, and a clinician can go through your specific worry with you.
Some people should check with their provider before getting MMR, or wait. The CDC lists people who have had an allergic reaction to a previous MMR dose, people who are or may be pregnant, people with a weakened immune system, people who bruise or bleed easily, people who recently had a blood transfusion, people with tuberculosis, people who have had other vaccines in the past 4 weeks, and people who are feeling severely ill.
If you are also weighing a flu shot, our NYC Flu Vaccine Guide covers price, timing and free options.
Why is the outbreak affecting so many unvaccinated people?
PA AAP says unvaccinated people, particularly children under 5, face the highest risk of severe illness. The state’s October 2 update reported that only four of 977 cases were among vaccinated people. The Department of Health describes vaccination as the best protection and reports that more than 53,000 MMR doses were administered statewide in September, more than double a typical month.
Parents may have different questions about records, safety, access, or timing. A clinician or pharmacist can help review the child’s own vaccination history and the local exposure situation without making the decision feel like a guessing game.
What is known about deaths and severe illness?
Pennsylvania reported five confirmed measles-associated deaths as of October 2, 2026, and PA AAP also reported five as of October 21. The state’s definition requires clinical evidence and a positive laboratory test, with death within 30 days of symptom onset and not due to an unrelated cause. The CDC’s surveillance-definition resources explain that surveillance definitions are used to classify and count cases consistently across jurisdictions.
The Department of Health’s October 2, 2026 update listed 195 hospitalizations among 977 cases. It says measles can lead to serious complications including pneumonia and encephalitis, especially in children younger than 5. The state also says people with symptoms should contact a health care provider.
How many children died from measles before the vaccine?
The CDC explains that before vaccines were available, nearly everyone was infected with measles and related viruses during childhood. CIDRAP adds that before the measles vaccine, most people infected were under 5, and virtually everyone was immune by age 15. For a historical death total, start with the measles pages on cdc.gov.
Before you act
- Use the state dashboard for the latest county count; totals can move between updates.
- Check whether you have documentation of two MMR doses instead of relying on memory.
- If exposure or symptoms are possible, call ahead to a clinician or 877-724-3258.
- For a child’s MMR questions, ask a pediatric clinician or pharmacist to review the child’s record and local circumstances.
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.
