An outbreak of measles in northwest Texas grew to 159 cases on Tuesday, about a dozen more than health officials reported late last week. The latest update from the Texas Department of State Health Services shows the outbreak remains concentrated in school-aged children who have not received the vaccine that protects against measles,

A measles outbreak in Texas has grown to 159 cases, and the U.S. Centers for Disease Control and Prevention says it is now on the ground in that state to respond.

In Texas, there were 146 cases of measles across the state and the South Plains, with 20 patients hospitalized. The best way to prevent getting sick is to get two doses of a measles vaccine.