Avian Flu Symptoms and Prevention Avian influenza, commonly known as bird flu, is a type of influenza caused by avian viruses. It typically affects birds but can also infect humans under certain conditions. The symptoms of avian flu are similar to those of regular flu, but they can be much more severe in some cases. The early symptoms can include fever, cough, muscle aches, and difficulty breathing. In severe cases, complications like pneumonia and acute respiratory distress syndrome may occur. Early Symptoms At the onset, individuals may experience symptoms similar to those of the common flu, such as fever, headache,... Learn more