Just to let everyone know, if they don’t already: freebooks4doctors has a downloadable text, Influenza Report 2006. It is a 225-page, 2.7 MB PDF. Being from 2006, it does not specifically cover the current situation. Rather, it focuses a bit on avian influenza. Still, it is a reasonably good source of information. If you want, you can buy a hard copy for 25 Euros, but anyone can download the free copy.
Influenza Report is a medical textbook that provides a comprehensive overview of epidemic and pandemic influenza. Influenza Report has also been published in Albanian, Chinese, Croatian, German, Indonesian, Italian, Mongolian, Serbian, and Slovenian.