Encyclopedia of Earth
Encyclopedia of Earth: Bird Flu
Facts about avian influenza, or bird flu, and one strain of it, avian influenza A, also known as H5N1. Covers the origin, transmission to humans, risks, symptoms, and treatment. (Updated: June 2, 2012)
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.