Centers for Disease Control and Prevention
Centers for Disease Control: Preventing the Flu: Questions and Answers
Find simple answers to several common questions about the flu including: "How does the flu spread?" "What are the symptoms of the flu?" "How long is a person contagious?" "What is the difference between a cold and the flu?" "At what age...
World Health Organization
World Health Organization: Influenza
This competent site explores the following topics: overview, the virus, pandemic influenza, transmission, diagnosis, prevention, and treatment. Related links are provided for additional information.