Health officials expect a measles outbreak in West Texas to exceed 100 cases because of low vaccine rates and undetected infections. Vaccine misinformation and new laws may make such situations more common and harder to contain.

A growing measles outbreak in Texas has 90 confirmed cases — a jump from a few days ago. The virus is spreading primarily among people who are unvaccinated or whose vaccine status is unknown.

Texas' measles outbreak is up to 90 cases. Here's what you need to know about the virus, vaccination and boosters.