The number of confirmed measles cases reported in an outbreak in West Texas is now at 124, the Texas Department of Health Services said in an update Tuesday, an increase of 34 since late last week.

State medical experts have confirmed 124 cases of measles in Texas. This is the largest measles outbreak in Texas in 30 years. Here is how it started and an overview of the situation, as of Feb. 25.

The measles outbreak in Texas has escalated sharply to 90 cases as health officials worry about the spread to more communities.