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Influenza, commonly known as the flu, is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin one to four (typically two) days after exposure to the virus and last for about two to eight days.
Zakażenia Haemophilus influenzae typu b występują na całym świecie i dotyczą głównie nieszczepionych dzieci oraz osób z niekompletnym podstawowym cyklem szczepień.
3 paź 2023 · WHO fact sheet on influenza: includes key facts, definition, symptoms, transmission, seasonal epidemics, effects, prevention, WHO response.
27 lis 2009 · Influenza is an acute viral infection that primarily attacks the upper respiratory tract, including the nose, throat, bronchi and, less frequently, the lungs. The disease occurs worldwide and spreads very quickly in populations, especially in crowded circumstances.
Seasonal flu is a contagious illness caused by the influenza virus. It kills an average of 700,000 people each year from respiratory disease or cardiovascular disease. 1 In large pandemics, when new strains have evolved, the death toll has been much higher. Yet, data on the flu is limited.
Flu, also called influenza, is an infection of the nose, throat and lungs, which are part of the respiratory system. The flu is caused by a virus. Influenza viruses are different from the "stomach flu" viruses that cause diarrhea and vomiting.
Influenza (flu) is a contagious disease with mostly respiratory symptoms caused by infection with an influenza virus. Every year during the winter season, seasonal influenza affects Europe and other parts of the northern hemisphere. It can cause epidemics of varying sizes.
