For those who were vaccinated for measles many decades ago, there’s a chance the protection has worn off by now. Here's how to determine whether you need a booster.

Measles was thought to be eliminated two decades ago. But growing mistrust in vaccines has changed that, and now some people may need booster shots for protection.

As the measles outbreak in Texas spreads, attention is turning to what is commonly called the MMR vaccine. The vaccine is the only way to prevent measles, but it also prevents other illnesses. The other “M” stands for mumps,