In Pennsylvania, health officials have reported a fourth measles death. All four deaths have occurred just in the last month. 2026 is now on record as the deadliest year for measles in the U.S. since the virus was declared eliminated in 2000. Pennsylvania had not had a measles-related death in at least 35 years. The deaths include an 18-year-old teen and a 40-year-old woman, both of whom were unvaccinated, as well as a 6-week-old baby and a newborn who died shortly after birth.