World Health Organization
World Health Organization: Avian Influenza (Bird Flu)
The World Health Organization (WHO) provides information, statistics, recent reports, and advice to international travelers regarding avian influenza--and features a "fact sheet" for concise and basic information on the virus.
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.
Centers for Disease Control and Prevention
Centers for Disease Control: Key Facts About Avian Influenza (Bird Flu) and Avian Influenza a (H5 N1) Virus
This site provides general information about avian influenza (bird flu) and one type of bird flu (H5N1). Information is also provided on human health risks, treatment, and vaccination.