The Centers for Disease Control and Prevention said it would join a conference hosted by the World Health Organization in apparent defiance of President Donald Trump's executive order.
Measles is a highly contagious airborne disease caused by a virus, and can be severe or even fatal. According to the U.S. Centers for Disease Control and Prevention (CDC), the best way to protect yourself against measles is to get vaccinated. Here, TIME answers all your questions about the vaccine.
Check state vaccine registries. Some states and major cities have vaccine databases, though they may be incomplete. Contact past providers. Past doctors, schools, universities and even employers like the military may have vaccine documentation.