Influenza is an infectious and contagious disease which is caused by the attack of influenza virus. It ranges from mild to severe in its symptoms. Common symptoms associated with it are high-grade fever, runny nose, sore throat, watering eyes, reddened face, body pains, headache, coughing, sneezing and fatigue. To prevent this infection frequent hand washing, wearing a surgical mask and vaccinations is helpful. If a person is suffering from this infection potent antiviral drugs are used.