The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From SK8 Wireless Technologies:
Communicating critical information about the flu and its impact.The purpose of the Influenza app is to use promote healthy behavior for flu prevention using the convenience of mobile devices. Influenza app provides comprehensive information on seasonal, H1N1 (swine), H5N1 (bird) and pandemic influenza for the public. Information is sourced from the Centers for Disease Control and Prevention (CDC) website and RSS feeds.Feeds include:-Seasonal Flu Updates (CDC)-Flu.gov News and Information-CDC Influenza PodcastsThis application was submitted as part of the CDC Flu App Challenge http://fluapp.challenge.gov/