According to the CDC, if you were born after 1957, one dose is considered sufficient to be considered protected from measles. Some adults may need a second dose. The CDC says adults who are going to be in high-risk settings for transmission should make sure they’ve had two doses at least 28 days apart.

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.