Influenza - The How's and Why's

So I get home, plop down in front of the computers, check my Tweets and Facebook lists, and there is a link to the best article I have seen in weeks from a science point of view; thanks to Brenda on Facebook. So, I click the link to the NPR story and see the best video rendition of what a virus does to the body. I'm gonna use this with my students. I know it will induce a whole series of questions but it's important that they understand the workings of a virus and get out the their heads some of the mystery surrounding how disease works in the human body.