With measles cases in more than 20 states across the U.S., doctors and health officials are urging anyone who hasn't received the MMR vaccine to get vaccinated. "To be very clear, the number one ...

But can you get measles if you've been vaccinated? Do you need a booster? Here's what to know. Need a break? Play the USA TODAY Daily Crossword Puzzle. See map: Measles cases in US surpass 100 ...