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Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. The most common symptoms of influenza (flu) include fever, a dry cough, headache, muscle and joint pain, a sore throat and a runny nose. This makes it one of the most.
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It can cause illness ranging from mild to severe,. Who fact sheet on influenza: Influenza is an acute viral infection that primarily attacks the upper respiratory tract, including the nose, throat, bronchi and, less frequently, the lungs.
It is characterized by a sudden onset of fever, cough.
Every year, mainly during the winter season, seasonal influenza infects as many as 1 billion people. Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. It can cause mild to severe illness. It is characterized by a sudden onset of fever, cough (usually dry),.
Includes key facts, definition, symptoms, transmission, seasonal epidemics, effects, prevention, who response. The virus is transmitted easily from person to person via droplets. Influenza, or the flu, is both a seasonal and a pandemic virus. Influenza (flu) is a contagious respiratory illness caused by influenza viruses.
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.
