Generally, the health code of people who receive centralized or isolated medical observation and management at home is red. This group includes those who are positive for nucleic acid detection, confirmed cases, asymptomatic infected persons, suspected cases, close contacts of close contacts, entry personnel, and those who have lived in China's medium and high-risk areas in the past 14 days. At the same time, the health codes of other high-risk personnel who need emergency tracking and isolation management are also red.
Close contacts refer to people who had close contact with suspected cases and confirmed cases two days before symptoms appeared (extended to the first four days according to the actual situation in some areas) or two days before asymptomatic infected people were sampled, but did not take effective protection.