The document discusses the flu, how to prevent it, and symptoms. It notes that the flu is a contagious respiratory illness caused by influenza viruses that can lead to mild or severe illness and sometimes death. Each year in the US, 5-20% of people get the flu, over 200,000 are hospitalized from complications, and around 36,000 die from it. The best way to protect against the flu is to get vaccinated each year in October or November. The flu shot cannot give you the flu as it contains killed viruses. Good health habits like avoiding contact, cleaning hands, and getting sleep can also help prevent flu.