People who have not been exposed to novel coronavirus infection are generally not likely to get sick. This is because the main sources of novel coronavirus infection are patients with novel coronavirus infection, suspected patients, and asymptomatic persons during the incubation period, and its transmission occurs through droplet and close contact with people, or aerosol transmission in confined spaces. If you have never been in contact with a person infected with the novel coronavirus, there is no chance of getting the disease. The best preventive measure is to go out less often, isolate yourself at home or always wear a medical-surgical mask that prevents the virus from attacking you when you go out. You should wash your hands frequently and not touch your mouth, nose or mouth with dirty hands after touching objects. You should wash your hands with alcohol or hand sanitizers containing alcohol to effectively inactivate the virus in order to effectively prevent the spread of the new coronavirus.