there is an epidemic in Haimen. According to the relevant public information, as of October 28th, 2122, the epidemic prevention and control situation in Haimen area is low-risk management, and the epidemic prevention and control measures require that the entry personnel be subject to 5 days of centralized isolation medical observation and 3 days of home isolation management measures, during which they are given a red code and are not allowed to go out. A nucleic acid test was carried out on the 1 th, 2 nd, 3 rd and 5 th day of centralized isolation medical observation, and a nucleic acid test was carried out on the 1 th and 3 rd day of home isolation medical observation.