Wikimedia
Wikipedia: Avian Influenza (Bird Flu)
Wikipedia provides a detailed, up-to-date overview of avian influenza that focuses on the infection, how it is spread to humans as well as its impact on humans, prevention and treatment, and more.
Centers for Disease Control and Prevention
Centers for Disease Control: Avian Influenza (Bird Flu)
The primary access point for CDC-produced information about avian flu: key facts, current outbreaks, questions and answers, virus spread, eradication efforts and plans, travel advisories, and similar resources.