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The influenza virus is a common viral infection that can result in death in certain groups of people. With this being said, the flu is also very preventable. Statistics show that the flu vaccine has drastically lowered the number of influenza cases over the years. A few other ways to prevent flu would be washing your hands and promoting hand washing to patients and children, staying home when you're sick, and covering your mouth when you cough or sneeze. A few symptoms include: fever, chills, muscle aches, cough, congestion, runny nose, headaches, and fatigue.