Neocollins can be transmitted through aerosols, so it is possible for a roommate to become infected with Neocollins. New coronavirus is a highly contagious virus. In places with poor air circulation, such as indoors, pathogens excreted from the body of a person infected with the new coronavirus may float in the air, and those who come into contact with them may be infected. When the roommate is confirmed to be infected with the new coronavirus, the person in close contact with him/her as the first close contact must be isolated in time, and the place of residence should be disinfected at the end of the day in order to prevent spillover of the epidemic. At the same time, close contacts should also be timely nucleic acid test and physical examination, so that early isolation, early detection, early treatment, such as after the longest incubation period without abnormalities can be lifted from isolation, if indeed infected with the need for timely treatment.