The health code b5 represents passengers and crew members who found positive cases in the same car except close contacts and close contacts as stipulated by the headquarters of the autonomous region.
According to the relevant regulations of epidemic prevention and control, there are four main groups of people with yellow health code: one is COVID-19 positive infected people. The second is the resident staff in key areas (key places). The third is the overflow of personnel in high-risk areas. Fourth, people who did not participate in regional nucleic acid testing as required.