Flu is the nickname for the illness caused by the sometimes deadly influenza virus. The Flu is considered to be a “cold” and is often dismissed as inevitable and since one has recovered completely so many times, just another nuisance. However, each year tens of thousands of people die because of those guys, not to mention the severe illnesses they cause. And about 80% of these deaths are in the elderly. The death toll is not accurate because Flu may not appear on the death certificate.