Influenza, commonly known as influenza, is an acute respiratory infection caused by the influenza virus, which is characterized by high contagiousness and rapid transmission. It is transmitted mainly through airborne droplets, person-to-person contact or contact with contaminated objects. Clinical symptoms are sudden onset of high fever, generalized pain and weakness and cough and other respiratory symptoms. The disease is caused by influenza virus, influenza virus can be divided into A (A), B (B), C (C) three types. Type A H1N1 is a type of A. Influenza is self-limiting, but in infants and young children, the elderly and patients with underlying heart and lung diseases are prone to complications such as pneumonia, which can cause death in severe cases. Blood tests for leukocytes and neutrophils are usually normal, but may be elevated if combined with a bacterial infection. Pathogenic tests include virus isolation, virus antigen, nucleic acid and antibody testing. Finding the virus is the “gold standard” for diagnosing the disease; antibody testing is generally used for retrospective investigations and is of little significance for early diagnosis of cases. Treatment includes etiology and symptomatic treatment, etiology includes: anti-influenza virus medication should be given as soon as possible within 48 hours, the common domestic medication is Kovir, divided into capsules and pellets, pellets are bagged, 15mg a bag, the usage is: generally less than 30 pounds of children once two bags, twice a day; 30-46 pounds of patients once three bags, twice a day, 46-80 pounds once four bags, twice a day Two times, greater than 80 pounds once five bags, twice a day; imported drugs are common is Tamiflu, adults twice a day, once 75mg, generally need to take 5 days. Symptomatic treatment includes: bed rest, drink more water, liquid or semi-liquid diet, nutrition, vitamin supplementation, and anti-infection treatment when the blood test is elevated. Influenza is usually self-limiting and patients without complications usually recover in 5 to 10 days. Patients with severe infections require hospitalization.