Influenza is an acute respiratory infection caused by the influenza virus, which is highly contagious. The disease is caused by the influenza virus, which can be divided into three types: A (A), B (B) and C (C), and there is no cross-immunity between the three types. Type A viruses often undergo antigenic mutation, are highly contagious, spread rapidly, and often cause widespread epidemics. The incubation period of influenza varies from 24 hours to 5 days, with pre-symptoms such as headache, chills and dry cough, sneezing, nasal congestion and runny nose, followed by headache, high fever (38-40°C), general muscle and joint pain, and general malaise. The pneumonic type of influenza can occur in the elderly, infants, chronically ill patients and immunocompromised people. This type mostly develops respiratory and circulatory failure within 5-10 days and has a poor prognosis. The virus can be transmitted to susceptible persons through the coughing and sneezing of influenza patients and contact with viral contaminants, etc. Patients are most contagious within 3 days of onset. The main measures to prevent influenza are: 1. Keep a distance of more than 1 meter from the patient When you notice that someone is about to sneeze or cough, you should immediately retreat to 1 meter away. If you encounter this situation in an elevator or on a bus, you can turn around immediately because the human eyes and nose are the most contagious. 2, timely vaccination Influenza vaccine can protect the human body up to 70%-90%, even after vaccination with the flu, can reduce its symptoms and reduce the chances of complications. 3, wash your hands regularly: research results show that the flu virus can survive for 70 hours in your hands. If a healthy person shakes hands with a patient or touches an object touched by a patient in a public place, the cold virus will be on his hands. So it is crucial to wash your hands regularly. 4, the best way to prevent the flu in winter is to maintain healthy habits, which is more effective than the flu shot. Do more exercise, more massage People who can be active for 3 hours a day have a 35% lower chance of getting the flu than those who are less active. Experts suggest that it is best to exercise three times a week, briskly walking, climbing stairs or playing table tennis. Experts also suggest that you can usually do more massage. Whether it is professional massage, or knocking each other’s backs, can increase the content of compound amines and dopamine in the blood, thus improving immunity. 5, diligent change of toothbrush: people use toothbrushes every day, if the top with a virus, it is easy to repeatedly infected; in addition, toothbrushes are often in a damp state, pathogens are prone to breeding and reproduction, which is extremely detrimental to health. 6, foot warmth: feet are more sensitive to temperature, if the feet are cold, will reflexively cause the nasal mucosa vasoconstriction, making people susceptible to cold viruses; at the same time, advocate cold water wash face. 7, light diet: high fat, high protein, high sugar diet will reduce the body’s immunity, diet is too salty, will make saliva secretion and oral lysozyme reduction, and reduce the secretion of interferon and other anti-disease factors, so that the cold virus easy to enter the respiratory mucosa and induce a cold. 8, happy spirit: medical doctors through the observation found that nervous, depressed people, the body of antiviral substances significantly reduced, immunity decreased, prone to colds. 9, reasonable sleep: to maintain adequate sleep is the most important thing in winter. Researchers from the University of Chicago found in their experiments that people who slept 7.5-8.5 hours a day, compared to those who slept only 4 hours a day, produced half of the antibodies. Therefore, it is very important for cold patients to ensure adequate sleep. 10, more open windows for ventilation: open the windows every day to change the fresh air, so that it helps to reduce the spread of bacteria. 11, do not blindly supplement vitamins: taking a large amount of vitamins every day is unlikely to reduce the chances of getting the flu, and will also be detrimental to health. The best way is to take a dietary supplement, but you can also take a multivitamin at once every day.