Why are there some red circles and arrows in the yard?

The local code is scanned, and there is a row of red letters on it, which is abnormal. What is displayed in the location code is actually the highlight of the health code, so if the location code turns red, it is actually a red health code. At this time, the holder of the prompt code may be a confirmed case, a suspected case, a person with positive nucleic acid test, a fever patient and a crowd from a middle-high risk area. Once the health code of the code holder is found to be red, isolation control measures should be taken as soon as possible and reported to the relevant departments for investigation. First, centralized isolation control should be carried out, and then nucleic acid detection should be carried out in time. Finally, it should be classified and disposed according to the results of nucleic acid detection and epidemic situation.