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,

Measles has sickened nearly 150 mostly unvaccinated people in rural West Texas, and a school-age child has died.

A Texas health official is warning against “measles parties” as an outbreak grows in West Texas, resulting in the death of at least one unvaccinated school-aged child. In a press briefing Friday, Dr.