US Measles Cases Reach 4,588 as Outbreak Continues, CDC Reports

The Centers for Disease Control and Prevention (CDC) reported 4,588 confirmed measles cases in the United States as of October 22, 2026, an increase of 178 cases from the previous week. This brings the 2026 total to roughly double the cases reported in all of 2025. Ninety-six percent of the cases are outbreak-associated, and 479 hospitalizations have been reported. Pennsylvania has seen 1,317 cases and five measles-related deaths, though the CDC has confirmed three deaths nationally.