How long will it take for calls with yellow code in Ningbo-

7 days. According to the policy of the Ningbo Epidemic Prevention and Control Center, it is known that calls with a yellow code in Ningbo will be made for 7 days. Within 7 days, epidemic prevention and control personnel will conduct telephone inquiries and investigations, and it will change to a green code after 7 days. Ningbo, referred to as "Ningbo", is a prefecture-level city, a sub-provincial city, a city under separate state planning, a type I large city under the jurisdiction of Zhejiang Province, and an important port city on the southeast coast of China approved by the State Council.