US measles cases rise by 178 in a week to 4,588 this year

US health authorities reported 178 more measles cases this week, bringing the 2026 total to 4,588, more than double last year's tally, across at least 43 outbreaks. Pennsylvania alone has 1,338 cases, while South Carolina and Utah each report over 500. Experts say official figures undercount the highly contagious, vaccine-preventable disease.