"Yellow code": the system audit found that the applicant was recorded as a close contact, isolated at home and did not review the symptoms of COVID-19, or the centralized isolation was less than 14 days; Make a yellow health code.
"red team": If through systematic review and comparison, it is found that the applicant is a confirmed (including clinical diagnosis), suspected or fever case, a red health code will be issued.
Data expanded from "red team" to "yellow code": The confirmed cases were cured and discharged, and there were no recurrence symptoms in isolation period 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 "yellow code" to "green code": Close contacts have no COVID-19 symptoms after flow adjustment, and the "yellow code" is changed to "green code" after isolation 14 days.
Change from "green code" to "yellow code": before the validity period of "green code", if there is no health record of temperature measurement, change to "yellow code"; "Green code" personnel found fever symptoms after temperature measurement, and turned to "yellow code".