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,

The number of people with measles in Texas increased to 146 in an outbreak that led this week to the death of an unvaccinated school-aged child, health officials said Friday. The number of cases — Texas’ largest in nearly 30 years — increased by 22 since Tuesday.

Texas is experiencing its largest measles outbreak in 30 years, primarily affecting the South Plains region. A child has died and several people have been hospitalized by the extremely contagious disease that was once considered eradicated,