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Information on Avian Influenza

Avian influenza refers to the disease caused by infection with avian (bird) influenza (flu) Type A viruses. These viruses occur naturally among wild aquatic birds worldwide and can infect domestic poultry and other bird and animal species. Avian flu viruses do not normally infect humans. However, sporadic human infections with avian flu viruses have occurred. The links below offer information about avian influenza for different audiences.

Current Viruses

H5 Viruses in the United States

Highly pathogenic avian influenza (HPAI) H5 infections have been reported in U.S. domestic poultry (backyard and commercial flocks), captive wild birds, and wild birds. No human infections with these viruses have been detected at this time, however similar viruses have infected people in other countries and caused serious illness and death in some cases. While the public health risk posed by these domestic HPAI outbreaks is considered low at this time, it is possible that human infections with these viruses may occur.


Avian Influenza A (H7N9)Avian Influenza A (H7N9)

Key facts, information for travelers, health care guidance, laboratory guidance, H7N9 images...

Health Care & Laboratorian Guidance

 Avian Flu Healthcare and Laboratory guidance

Testing and reporting, case definitions, specimen collection, infection control, treatment, vaccine development...

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