What is Influenza ( the "flu")?

"The flu" is a contagious respiratory illness caused by an influenza virus. It can cause mild to severe illness and in some cases can lead to death. Your  best defense against the flu is to be vaccinated each year. Key Facts About Seasonal Flu and Seasonal Flu Vaccine. Flu Season can range from October to as late as May. 

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1. What is Influenza ( the "flu")?
2. How Should Influenza (either seasonal or H1N1 flu) be Treated?
3. Who Should Get Vaccinated?
4. Who Should NOT be Vaccinated?