Measles Information

Recent updates from the Pennsylvania Department of Health indicate 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.

Overall, Pennsylvania maintains strong child vaccination coverage, with nearly 94% of kindergarten students fully immunized against measles statewide. Nevertheless, pockets of lower coverage exist, and certain individuals remain medically unable to receive the vaccine, leaving potential vulnerabilities for transmission within school communities.

Should the District suspect a student has contracted measles, we will immediately recommend an evaluation by their pediatrician and alert the Pennsylvania Department of Health to determine next steps.

To learn more about measles, please visit the Pennsylvania Department of Health webpage: https://www.pa.gov/agencies/health/diseases-conditions/infectious-disease/measles

Please contact your medical provider’s office with any questions.