Centers for Disease Control and Prevention
Centers for Disease Control: Influenza: The Disease
Find a list of "flu-like symptoms," learn who is at risk for developing the flu, and read about how the flu is spread. This website also provides a chart showing "peak months for flu activity" and advice for treating the flu and flu...
PBS
Pbs: American Experience: Influenza 1918: Rupert Blue
Describes the role that Rupert Blue, Surgeon General of the United States in 1918, played in combating and containing the influenza epidemic of 1918.
Other
Medinfo: Common Conditions: Influenza
This site describes the symptoms, causes, diagnosis, treatments, new developments, preventions, and high risk groups that would be susceptible to contracting influenza.