The outbreak would have to spread continuously for more than a year to undo the U.S.’s achievement.

The Texas health department reported 663 cases of measles in the state on Tuesday, an increase of 17 cases since April 25, as the U.S. battles one of its worst outbreaks of the childhood disease. Cases in Gaines County,

The Texas Department of State Health Services reported Tuesday its measles cases, which date back to late January, had grown to 663 cases as of Tuesday, marking a jump of 17 cases since the state’s last update as 87 of the patients have been hospitalized while two school-aged children have been confirmed dead from the illness.