Eight hundred cases of measles were reported in the United States as of April 17, 2025, representing the second highest annual case count in 25 years, according to research published in the April 24 issue of the U.

Texas health officials reported 663 measles cases in the state on Tuesday, accounting for the majority of cases across the U.S., which reached nearly 900 as of Friday, according to the Centers for Disease Control and Prevention.

The measles outbreak centered in the South Plains region of Texas grew to 663 cases on Tuesday, according to health officials. The latest update from the Texas Department of State Health Services adds 17 new cases since the agency's last update on Friday.