Pittsburgh’s kindergartners fall below the measles safety threshold, testing the city’s vaccine legacy

Pennsylvania has confirmed 693 measles cases across 38 counties this year, including 133 hospitalizations and three deaths among unvaccinated residents, compared with just 16 cases statewide in all of 2025. Allegheny County's kindergarten MMR vaccination rate has fallen to 91.8 percent, below the 95 percent threshold needed to stop the disease from spreading, continuing a decline the county health department has tracked for more than a decade.

The piece, written by an epidemiologist at Allegheny College, situates the outbreak against Pittsburgh's history as the birthplace of the Salk polio vaccine, testing whether that legacy still shapes public behavior. The MMR vaccine is free through the state's health centers and covered by most insurance, and each measles case is estimated to cost the healthcare system roughly $43,000.

The full dispatch is available from the source below.