Preventing the Spread of Flu During Flu Season

We've all been there before, an elevator or an office or a classroom when suddenly one person coughs. Then another. And another. And before you know it, people seem to be sniffling and coughing everywhere and you feel a slight headache coming on. Flu season has arrived.

So how do we prevent the spread of flu when we're all in enclosed spaces and everyone seems ill, except for those with unbelievable, superhuman immune systems? Dr. Christopher Lee, Head of the Infectious Diseases Department, lays out the basics for us.