Copy the text below to embed this video on your webpage:
Explained: How the flu virus spreads
The flu season is well under way in the United States. To help protect yourself from the virus, find out how it spreads, then avoid these circumstances. You may be surprised how quotidian some of them are.
Join the conversation...
They've been there for you! 16 best 'Friends' cameos
'7th Heaven' reunites + 7 other TV show reunions!
The battle for planet Earth, in photos
Chef to picky eaters: We don't give a #%&!
Eric Cartman trolls Redskins in ad during game
A dying mom's wish for her only son
When does spanking cross the line?
Police ID man in Hannah Graham video
Are the newest iPhones worth the wait?
Clemson drops quiz asking about students' sex lives