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It is characterized by a sudden onset of fever, cough … · the world health organization (who) today announced the recommendations for the viral composition of influenza vaccines for the 2025–2026 influenza season in the northern … · 概述 季节性流感（流感）是由流感病毒引起的急性呼吸道感染。季节性流感在世界各地都很常见。大多数人不治而愈。 当人们咳嗽或打喷嚏时，流感很容易在人与人之间传播 … This makes it one of the most … · who fact sheet on influenza: The virus is transmitted easily from person to person via droplets. Influenza (flu) is a contagious respiratory illness caused by influenza viruses. Number of influenza viruses detected by subtype, are … · seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. Flunet is a global web-based tool for influenza virological surveillance first launched in 1997. It is characterized by a sudden onset of fever, cough (usually dry), … · the most common symptoms of influenza (flu) include fever, a dry cough, headache, muscle and joint pain, a sore throat and a runny nose. 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. The virological data entered into flunet, e. g. Includes key facts, definition, symptoms, transmission, seasonal epidemics, effects, prevention, who response. Influenza, or the flu, is both a seasonal and a pandemic virus. We provide member states with strategic guidance, technical support and coordination of activities essential to make their health systems better prepared against seasonal, zoonotic …
