Gardening blog Biosecurity and bird flu: what it means for back garden poultry Bird flu outbreak at Tennessee poultry farm confirmed after chicken deaths. The bird flu (also known as influenza A or the avian flu) primarily infects birds, but can pose health risks to people. Learn how to avoid this flu. Avian influenza refers to the disease caused by infection with avian (bird) influenza (flu) Type A viruses. These viruses occur naturally among.