To give you some historical background, and eyewitness and patient history, here's a documentary on the 1918 Pandemic Flu. This will open your eyes, I think.

The point is not to worry you. The point is to make you aware of the challenges. This allows you to let your mind turn over the issues and do a natural unfolding of events as you imagine this sort of pandemic in 2013. How would it be different or the same?