Feb 28, 2025 · WHO fact sheet on influenza: includes key facts, definition, symptoms, transmission, seasonal epidemics, effects, prevention, WHO response.

Nov 27, 2009 · Symptoms Influenza is characterized by a sudden onset of high fever, cough, headache, muscle and joint pain, malaise, and a runny nose lasting 2 to 7 days. Influenza is usually mild and …

Nov 30, 2025 · Seasonal influenza (‘the flu’) is an acute respiratory infection caused by influenza viruses that circulate globally and year-round. It can cause illness ranging from mild to severe, sometimes …

Mar 25, 2025 · Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. It is characterized by a sudden onset of fever, cough (usually dry), …

Aug 18, 2025 · Influenza symptoms are usually mild but can also be severe, especially among high-risk individuals. Symptoms include: Most people recover from fever and other symptoms within a week …

May 16, 2024 · WHO questions and answers page on avian influenza – A(H5N1) – including symptoms, treatments and prevention.

May 16, 2024 · H5N1 is one of several influenza viruses that causes a highly infectious respiratory disease in birds called avian influenza (or "bird flu"). Infections in mammals, including humans, have …

Nov 13, 2019 · The most common symptoms of influenza (flu) include fever, a dry cough, headache, muscle and joint pain, a sore throat and a runny nose.

Oct 3, 2023 · Exposure to animal influenza viruses can lead to infection and disease in humans – ranging from mild, flu-like symptoms or eye inflammation to severe, acute respiratory disease and/or …

Oct 14, 2024 · COVID-19 and seasonal influenza (flu) are respiratory infections caused by two different viruses. While some of the signs, symptoms and population groups at risk of severe complications …