Latest PA Measles Outbreak Unconnected To Montgomery County Case

NORRISTOWN, PA — The latest outbreak of measles in southeastern Pennsylvania is connected to the case that was discovered last month in Montgomery County, officials confirmed this week.

Exposure incidents occurred at both the CHOP Emergency Department on March 10 and the South Philadelphia Health and Literacy Center on March 7, according to Philadelphia health officials.

Authorities are warning anyone who was exposed during that timeframe to quarantine themselves for 21 days if they do not have the measles vaccine. If they're vaccinated, however, there is no cause for concern, as the vaccine provides immunity.

"We know that this measles case is not associated with either the recent case in Montgomery County or the ongoing outbreak in Texas," Philadelphia Health Commissioner Dr. Palak Raval-Nelson said Wednesday. "As vaccination rates across the country continue to drop, there are more and more opportunities for people who cannot be vaccinated to be exposed to this deadly disease."

A spokesperson for the Montgomery County health department told Patch that they had no update on contact tracing efforts underway for the case found last month.

The case was found in an unvaccinated child who has been exposed to the public at numerous points, including public transportation from JFK to Philadelphia, and multiple healthcare facilities in Montgomery County.

Related: Measles Case Confirmed In Montco

The case was the first in Pennsylvania in 2025.

Symptoms of measles include cold-like symptoms, runny nose, red eyes, greyish-white spots in the mouth, fever, and more. It's transmitted most commonly through coughing and sneezing.

Measles can remain infectious in the air and on surfaces for up to two hours after an infected individual leaves that area.

The MMR vaccine that provides full immunity is available at many healthcare provider offices and pharmacies.