Texas is in the midst of the worst measles outbreak in decades, with 90 cases across 7 counties. Here’s what to know.

Cases of the highly contagious disease are expected to rise and potentially spread to other states where vaccination rates are low.

The U.S. Centers for Disease Control and Prevention on Friday reported that measles cases so far this year had jumped to 93 from 14 a week ago, mainly driven by an outbreak in Texas.