WHO fact sheet on avian influenza: includes key facts, definition, clinical features, antiviral treatment, risk factors for human infection, human pandemic potential. Avian flu is a strain of flu that infects birds. Avian flu can be passed from birds to humans, and in very rare cases, between people. Introduction. Bird flu, or avian flu, is an infectious type of influenza that spreads among birds. In rare cases, it can affect humans. There are many different strains. Bird flu addresses will not be shared with third parties. Signs and freeslott925 Like other types of flu, bird flu symptoms often include: Your suggestions will help us improve this article. It is not possible to prevent bird flu from spreading, but the authorities can help communities prepare for possible infections by monitoring bird migration patterns. What is bird flu?