How many days does it take for the yellow code in Beilun, Ningbo to turn green?

It takes 7 days for the yellow code in Beilun, Ningbo to turn green. At present, the personnel assigned to red team, except the close contact and sub-close contact, have negative reports of nucleic acid detection twice every 24 hours after the code is assigned, and the health code is transcoded into yellow code. At present, the yellow code has been assigned, and the continuous nucleic acid test has been negative in the last 7 days, and the healthy code has been transcoded into green code.