Once a person becomes infected with the virus, he or she is usually not contagious, but to be on the safe side, the latest treatment protocol requires seven days of home health monitoring. When infected with Neo-Crown virus, the infected person becomes the main source of infection and can cough or sneeze the virus out of the body and infect others through respiratory droplet transmission or contact transmission. After the new crown negative, that is, from the infected person’s body can not detect the new crown virus nucleic acid, that is, the infected person will not discharge the virus, so generally is not contagious. However, the latest treatment protocol requires seven days of home health monitoring after a newly infected person is released from quarantine or hospitalization. Live in a well-ventilated single room and wear a mask, avoid contact with family members, practice good hand hygiene, and avoid going outside.