Influenza is a viral disease which causes fever, fatigue, body aches, cough, sore and dry throat, lack of appetite. The person affected by influenza faces these symptoms and become less active and tired more than usual. Every year people get affected by influenza virus because the strains of the viruses leep on changing hence, every year people become ill due to the new viral strain. This influenza is caused by mainly different strains of influenza virus A and B.
The influenza pandemic that occurred in 1918 was very severe because it caused devastation in people health since, 50 million
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