Wearing a mask in contact with an infected person can greatly reduce the chance of infection. If the virus is transmitted through the respiratory tract, such as the new coronavirus, mainly through droplets and other ways of infection, some studies have shown that if the new coronavirus infected people do not wear masks, healthy contacts wear masks, the infection rate can be up to 90%; if the new coronavirus infected people wear masks, healthy contacts do not wear masks, the rate of infection is reduced to 5%; if the new coronavirus patients and healthy people are wearing masks, the rate of infection is 1.5%. In addition, the chance of infection is also related to one’s own immunity, whether one has been vaccinated or not, and the duration of contact with patients with new crowns. If one’s own immunity is low, if one has not been vaccinated against new crowns, or if one has been in contact with patients with new crowns for a longer period of time, the risk of infection will be increased. In daily life, wearing a good mask when going out, getting vaccinated against New Crown in time, and actively exercising to strengthen one’s immunity can help reduce the risk of infection.