Avian Influenza (Bird Flu)

Avian influenza (AI) or bird flu is a group of viruses that occur naturally in birds. A virus is pathogenic if it can cause illness or death. Some AI viruses can infect birds but not cause many bird illnesses or death. Other AI viruses, termed highly pathogenic avian influenza (HPAI), can cause large numbers of bird illnesses and deaths. Currently there is concern about one of these viruses, known as highly pathogenic H5N1, because it is causing severe disease in chickens and other poultry in several continents . It has also been found in wild birds in the same areas. In some instances, people who have had close contact with sick poultry have also become infected and gotten very sick. Approximately half of the people known to be infected have died.

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