One code is the health code, and the other is the negative proof report of 24-hour nucleic acid test.
The epidemic prevention and control measures of "14+7+7" shall be implemented for overseas (returning) personnel, that is, after receiving centralized isolation 14 days at the place of first entry, they will be transported to a centralized isolation place in a closed loop for 7 days for centralized isolation medical observation, and then they will be monitored at home for 7 days after lifting centralized isolation, during which they will be tested for nucleic acids five times as required.