Under certain conditions it is possible to become infected if you come into contact with a hidden carrier. If it is clear that the new crown patients, the country is now taking isolation treatment, in addition to health care workers generally other people can not come into contact with, but the source of infection sometimes still exists, that is, hidden carriers. Because the patient is in a state with bacteria, but they do not know, and the virus is not less contagious, normal people in contact with the patient, whether it is droplet or direct contact, indirect contact, may be infected with the new crown virus. Hidden carriers are the main target of the current prevention and treatment of the new coronavirus. Source: Dr. Yurai