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What is Understanding Influenza: Symptoms & Prevention about?

Influenza is a contagious respiratory virus that affects millions of Americans each year. There are three main types of influenza viruses - A, B, and C - with type A being able to infect both humans and animals. The virus has a spiky surface with proteins that allow it to enter and exit host cells. It spreads through cough/sneeze droplets or touching infected surfaces. Symptoms include fever, cough, sore throat and fatigue. Major pandemics in history include the 1918 Spanish Flu and 2009 Swine Flu. Preventi

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