Second case of measles reported in Allegheny County

ALLEGHENY COUNTY, Pa. — The Allegheny County Health Department has confirmed a second resident tested positive for measles in 2026. The two infected individuals attended the same school but live in separate households, indicating a likely unknown exposure at the facility.

According to the Allegheny County Health Department website, that case was reported as of Thursday.

The first case of measles was reported on Monday.

Health officials said the person who contracted measles was under 18 years old and unvaccinated.

Officials said anyone who visited the Target at 9805 McKnight Road in the Pine Creek Shopping Plaza on Thursday, Oct. 1, between the hours of 3:45 p.m. and 5:45 p.m. could have been exposed to that first person.

Health officials immediately initiated a case investigation and contact tracing following the confirmation.

The department is working to determine how the individuals contracted the virus, identify any additional exposures and check for potential further cases.

As part of the investigation, the health department will contact individuals who were exposed to the infected residents while they were infectious. Health officials will reach out by phone or text message to offer guidance on how to reduce the likelihood of contracting or spreading measles.

Health officials are urging anyone who has not already been vaccinated for measles to consider doing so. Allegheny County has an Immunization Clinic that can help provide those vaccines. Click here to learn more about the clinic.

Dr. Jillian Irwin serves as the medical director for the Allegheny County Health Department.

“This connection significantly expands our investigation,” Irwin said. “Determining how these individuals were infected and the details of all additional exposures is key to successfully stopping further spread” The department recommends that anyone due for a measles, mumps and rubella vaccine contact their health care provider. In addition, health officials are recommending that health care providers administer the MMR vaccine on an accelerated schedule to patients ages six months and older.

Allegheny County will post daily updates on measles counts as needed at AlleghenyCounty.US/measles, and the Pennsylvania Department of Health will track cases on its statewide dashboard.

Symptoms for measles include a high fever (>101 degrees F), a cough, runny nose and red eyes, followed by a rash that usually starts on the face. Those can pop up seven to 21 days after someone is exposed to measles.

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