Neocoronavirus b contacts are more likely to be infected if they are immunologically weak, and neocoronavirus b contacts are less likely to be infected if they are immunologically strong. Novel coronavirus is a highly infectious and pathogenic respiratory virus. Once you have close contact with a patient with novel coronavirus, the probability of infection is higher, so you must pay attention to prevention and isolation protection. If a healthy person has had close contact with an infected person, but wears a medical mask in strict accordance with the requirements throughout the contact, the probability of contracting the new coronavirus will be drastically reduced. In addition, if the healthy person’s own immunity is relatively high, it is also possible that the immune cells in the healthy person’s body will completely eliminate the virus before the infection occurs, thus preventing the infection from occurring. It is therefore recommended to wear a mask when going to public places and to boost immunity through diet and exercise in daily life. In the event of contact with a newly crowned infected person, it is recommended to immediately consult the local infectious disease control center for quarantine and further treatment as required by the doctor.