Has Xinzhou’s code changed from green to red overnight?

No.

Xinzhou assigns "red codes" to confirmed patients, people in sealed and controlled areas, people in close and sub-close contacts, and people with a history of traveling to medium- and high-risk areas within 14 days. For those holding a "red code", control measures such as strictly prohibiting travel and conducting diagnosis and treatment in designated medical institutions or centralized isolation places, as well as isolation medical observation, are adopted. Not all people are assigned a red code.

Xinzhou City assigns "yellow codes" to key groups, time and space companions and other personnel. For those holding "yellow code", travel restrictions are adopted. They do not go out unless necessary, are not allowed to enter public places, participate in gathering activities, and are not allowed to take public transportation. They must accept nucleic acid tests and cooperate with the community to implement the epidemic. Prevention and control measures. Personnel assigned to management must cooperate with the community in implementing isolation control measures in accordance with regulations. Those who have completed the specified period of isolation medical observation or health monitoring, have no abnormal health status, and have a negative nucleic acid test result will automatically be adjusted to a "green code" at that time. Under normal circumstances, if there are no abnormalities, if the "red code" of the health code has been for 14 days and the "yellow code" has been for 7 days, the system will automatically decode it.