A growing measles outbreak in Pennsylvania has infected more than 70 people, prompting state health officials to expand vaccination campaigns and strengthen disease control efforts across multiple counties.
According to the Pennsylvania Department of Health, 72 of the state’s 84 confirmed measles cases in 2026 are connected to an outbreak that began in late April in the Lebanon and Lancaster county region. The outbreak has since spread to six counties, with health leaders emphasizing that increasing vaccination rates remains the most effective strategy to stop further transmission.
Pennsylvania Secretary of Health Dr. Debra Bogen said public health teams are working closely with local partners to identify cases, trace exposures, and provide vaccines to communities at risk. State-operated health centers have already administered more than 1,300 measles vaccine doses this year, including over 430 doses through pop-up vaccination clinics in the affected region.
Pennsylvania Measles Outbreak Raises Concerns
Measles is one of the world’s most contagious viral diseases. Individuals who have not received the recommended two doses of the measles, mumps, and rubella (MMR) vaccine face the highest risk of infection and transmission.
Early symptoms typically appear seven to 14 days after exposure and include:
- High fever
- Persistent cough
- Runny nose
- Red, watery eyes
Within a few days, tiny white Koplik spots may develop inside the mouth, followed by the disease’s signature red rash that spreads from the face to the rest of the body.
Hospitalizations Reported Due to Severe Complications
Doctors at Penn State Health Lancaster Medical Center have treated several patients suffering from serious complications related to measles.
Infectious disease specialist Dr. Fahmida McGann said some hospitalized patients experienced electrolyte imbalances, liver and kidney dysfunction, abnormal blood counts, and other complications that increased the risk of organ failure, secondary infections, and bleeding.
Although most people recover from measles, severe complications can include pneumonia, encephalitis (brain swelling), hearing loss, permanent neurological damage, and, in rare cases, death.
How Measles Spreads
Health experts warn that people infected with measles can spread the virus from four days before the rash develops until four days afterward.
The virus spreads through respiratory droplets released when an infected person coughs, sneezes, or talks. It can also remain suspended in the air or survive on surfaces for up to two hours, making indirect exposure possible.
According to global health estimates, one infected individual can transmit measles to as many as 18 unvaccinated people.
Infants, pregnant women, immunocompromised individuals, cancer patients, organ transplant recipients, and older adults face a greater risk of developing severe illness.
Vaccination Remains the Best Protection
Health officials continue to stress that the MMR vaccine provides approximately 97% protection after two doses.
Children typically receive their first dose at 12 to 15 months of age and a second dose between ages four and six. Adults who are uncertain about their vaccination status are encouraged to speak with a healthcare provider about receiving the vaccine.
Officials also advise anyone experiencing possible measles symptoms to contact their healthcare provider before visiting a medical facility, helping reduce the risk of exposing others.
Public health authorities say they will continue expanding vaccination efforts as they work to bring the Pennsylvania measles outbreak under control.
