The Texas health department reported 702 cases of measles in the state on Tuesday, an increase of 19 cases since May 2, as the U.S. battles one of its worst outbreaks of the childhood disease.

The measles outbreak that started in the South Plains region of Texas surpassed 700 cases on Tuesday, according to health officials. The latest update from the Texas Department of State Health Services shows the state has seen 702 cases of measles since the outbreak began spreading in late January.

State health officials on Tuesday said the number of measles cases in the state linked to a West Texas outbreak has grown to 702 since January.