It doesn't turn yellow under normal circumstances. It's only a stopover, even if you stay in the risk area of the middle room for a while, it won't affect the health code.
The main population whose health code turns yellow is: people from high-risk areas within 14 days, or people who have been to key areas (passing through cities in middle-high risk areas); Personnel in prefecture-level cities where local epidemics occur and in neighboring areas with proliferation risks; Persons who are abnormal within 14 days in the provincial epidemic database; The discharged patients were cured within 14 days after home observation; Asymptomatic infected persons who have been released from medical isolation for less than 14 days; Overseas personnel who have not completed the quarantine period; Other personnel who need to be included in the management of medium-risk personnel.
It is necessary to pay close attention to the dynamic changes of "code color", report any abnormality to the community (village residence) or work unit immediately, and actively cooperate with the implementation of prevention and control measures. People who have been to or passed through high-risk areas within 14 days will be quarantined 14 days. Those who have contact with the above personnel should be monitored at home for 7 days and tested for nucleic acid twice.