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Measles Makes a Dangerous Comeback as Pennsylvania Outbreak Tops 1,000 Cases

University of Mary Washington infectious disease expert Dr. Lynn Lewis can explain why measles is spreading, the risks it poses and what can be done to prevent further outbreaks.

Oct 12, 2026

2 min

Measles was declared eliminated in the United States in 2000. More than 25 years later, the highly contagious disease is making a troubling comeback, with Pennsylvania now confronting an outbreak that has surpassed 1,000 confirmed cases.

According to an October 7 update from the Pennsylvania Department of Health, the state has recorded 1,078 confirmed cases across 41 counties, including 207 hospitalizations and five measles-associated deaths. The figures underscore the serious public health consequences of a disease that can largely be prevented through vaccination.

The outbreak is also raising important questions about declining vaccination rates, community immunity and whether other states could experience similar outbreaks.

Measles spreads through the air when an infected person breathes, coughs or sneezes. The virus can remain infectious in the air for up to two hours after an infected person leaves an area. Early symptoms include fever, coughing, a runny nose and red, watery eyes, followed by a distinctive rash that typically begins on the face and spreads downward.

While many people recover, measles can cause serious complications, including pneumonia, brain swelling and, in rare cases, death. Two doses of the measles, mumps and rubella (MMR) vaccine are approximately 97% effective at preventing the disease.

Understanding the Outbreak and What Comes Next

Dr. Lynn O. Lewis, a Professor of Biological Sciences at the University of Mary Washington, brings extensive expertise in microbiology, virology and infectious diseases.

Lewis also directs the university's Irene Piscopo Rodgers School of Science and helped provide scientific guidance during the COVID-19 pandemic.

View her profile

With measles cases continuing to mount, Lewis can provide valuable perspective on how the virus spreads, why vaccination remains critical and what public health officials can do to contain outbreaks.

She is available to help journalists explore several important questions:

Why is a disease once eliminated in the United States returning?
What makes measles so contagious?
How do vaccination gaps contribute to outbreaks?
And what lessons from the COVID-19 pandemic can help communities respond more effectively?

As Pennsylvania continues its response, the outbreak is a reminder that infectious diseases once considered under control can re-emerge when the conditions that prevented their spread begin to change.

If you're interested in speaking with Dr. Lynn Lewis about the Pennsylvania measles outbreak, infectious disease transmission, vaccination and public health preparedness, simply click on her profile below to arrange an interview today.

Connect with:

Lynn O. Lewis

Professor and Director of the Piscopo Rodgers School of Science

Lynn Lewis is a Professor of Biology and Director of the Piscopo Rodgers School of Science at the University of Mary Washington.

BiologyMicrobiologyVirologyUniversity TeachingAcademic Advising

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