Texas and New Mexico health departments said on Friday that the number of measles cases in their states rose 20% since their last reports three days ago, as experts warn they expect the outbreak to further spread in coming weeks.

Texas' outbreak began two months ago. State health officials said Friday there were 73 new cases of measles since Tuesday, bringing the total to 400 across 17 counties — most in West Texas. Forty-one people have been hospitalized since the outbreak began, and Andrews and Midland counties were new to the list.

At least five states have active measles outbreaks as of Friday, and Texas' is the largest with 400 cases. Already, the U.S. has more measles cases this year than in all of 2024, the U.S. Centers for Disease Control and Prevention has said.