An infant in Wisconsin has died of measles — the state's first such death since 1990 and the third in the U.S. that week, according to its health department — bringing 2026's measles-associated death toll to eight, the highest since 1991, amid a rise to 4,852 cases linked in part to declining vaccination rates. Pennsylvania is grappling with the country's largest outbreak, approaching 1,500 cases across 45 counties, and Wisconsin recommends an early vaccine dose for infants as young as 6 months at increased risk of exposure.