If you were born between 1957 and 1975 in the U.S., you probably got only one measles vaccine and need another shot. Even if you're younger and got both shots, immunity can fade. Here's how to figure out if you need another dose https://www.scientificamerican.com/article/how-to-check-if-you-have-immunity-to-measles-or-need-another-dose/ @tarahaelle