08/26/2026
Public Service Announcement
The Pennsylvania Department of Health indicated a rise in reported measles cases across the commonwealth. As of August 19, 2026, Pennsylvania has recorded 340 cases this year, with two identified within Lehigh County.
Measles is a highly contagious virus that spreads through airborne transmission, typically when an infected individual coughs or sneezes. Contagiousness spans from four days prior to the rash's onset to four days after it appears. While symptoms generally develop within 7 to 14 days post-exposure, the incubation period can extend up to 21 days.
Alongside the characteristic rash, common symptoms include high fever, coughing, nasal congestion, and inflamed, watery eyes. Severe health complications can arise—including lung infections like pneumonia and brain inflammation like encephalitis—which may lead to hospitalization or fatal outcomes.
Immunization offers the best protection against the virus, specifically through a two-dose series of the measles, mumps, and rubella (MMR) vaccine. Receiving both doses yields roughly 97% protection, while a single dose provides about 93%. For the vast majority of individuals, the MMR vaccine secures lifelong immunity.
For more info:
To learn more about measles, please visit the Pennsylvania Department of Health webpage: https://www.pa.gov/agencies/health/diseases-conditions/infectious-disease/measles.
Measles is a disease that spreads easily from person to person and can make you sick. People who are not vaccinated are at the highest risk. The best protection against measles is vaccination. DOH is working closely with health care providers and local communities to prevent the spread of measles.
