Pennsylvania confirms 1,004 measles cases, five deaths in largest U.S. outbreak in decades

Pennsylvania health officials confirmed 1,004 measles cases in 2026 as of Oct. 5, with 198 hospitalizations and five deaths. The outbreak, which began in April west of Philadelphia, has spread to 39 counties, with Lancaster County hardest hit at 391 cases. It is described as the largest U.S. measles outbreak in decades.