Influenza, or the flu, is both a seasonal and a pandemic virus. It is characterized by a sudden onset of fever, cough (usually dry),. Includes key facts, definition, symptoms, transmission, seasonal epidemics, effects, prevention, who response.
It is characterized by a sudden onset of fever, cough. It can cause illness ranging from mild to severe,. Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world.
Influenza (flu) is a contagious respiratory illness caused by influenza viruses. This makes it one of the most. Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. The virus is transmitted easily from person to person via droplets.
Influenza is an acute viral infection that primarily attacks the upper respiratory tract, including the nose, throat, bronchi and, less frequently, the lungs. It can cause mild to severe illness. The most common symptoms of influenza (flu) include fever, a dry cough, headache, muscle and joint pain, a sore throat and a runny nose. The world health organization (who) today announced its recommendations for the viral composition of influenza vaccines for use in the 2026 influenza season in the.