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.

Texas’ measles outbreak has grown to 702 cases across 29 counties, according to a Tuesday update from the state public health department. The Texas Department of State Health Services estimates that less than 1% of those cases — or fewer than 10 of the reported cases — are “actively infectious.

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.