The measles outbreak in West Texas now counts almost 600 cases, according to Texas health data released Friday. The 597 cases is 36 more than were tallied Tuesday, according to information from Texas Health and Human Services.

The Texas Department of State Health Services on Friday, reported 597 measles cases in the state since late January, an increase of 36 since the update on Tuesday. The department said the outbreak is primarily in West Texas and added that 4% or fewer than 30 of the confirmed cases are estimated to be actively infectious since their rash onset date was less than a week ago.

The Texas public health department reported 36 more measles cases on Friday in the outbreak that began in Gaines County.