Asian influenza is a type of viral infection that primarily affects birds. It is caused by the H5N1 strain of the influenza virus and can be transmitted to humans, leading to severe respiratory illnesses. This type of influenza is also known as avian flu or bird flu. Other synonyms for Asian influenza include bird influenza, avian influenza A, avian flu virus, and H5N1 influenza. Symptoms of this illness include fever, cough, sore throat, headache, body aches, and fatigue. It is important to seek medical attention if you suspect that you have been exposed to the virus to prevent further spread.