Code "red" to "yellow": the confirmed case was cured and discharged, and there was no recurrence in isolation 14 days; The suspected and febrile patients were diagnosed, and COVID-19 cases were excluded. After 14 days of quarantine, COVID-19's symptoms did not appear, and a "yellow code" was issued.

Change from "yellow code" to "green code": Close contacts have no COVID-19 symptoms after epidemic control, and the "yellow code" changes to "green code" after quarantine 14 days.

Isolation preventive measures

1. The quarantined person should cooperate with the community medical staff to measure the body temperature twice a day and monitor the symptoms such as cough and shortness of breath.

2. Try to choose a well-ventilated single room for living. If the conditions are insufficient, the isolated person should consciously limit the activity area and keep a distance of 1m from others.

3. Refuse to visit and arrange care for family members without basic diseases. Both parties should wear N95 masks or medical surgical masks. Nurses need to wear disposable gloves when they come into contact with quarantined people.