Feb. 28, the number of measles cases in West Texas has risen to 146, with 20 hospitalizations, in an outbreak primarily affecting children and teenagers.

An outbreak of measles in northwest Texas grew to 146 cases on Friday, two days after health officials reported that a child had died after being hospitalized in Lubbock. Twenty people have been hospitalized for treatment amid the outbreak,

A child’s death this past week in Texas is the first U.S. death from measles, a highly contagious but preventable respiratory disease since 2015, according to the U.S. Centers for Disease