Class 17 people in Wuxi are zero-day zero-inspection personnel, including employees in wholesale markets, freight stations, logistics parks, highway service areas and inspection points, construction sites, employees in densely populated places with more people in foreign-related cities, freight drivers and passengers, couriers, takeout personnel, fresh food delivery personnel, dormitory administrators, sanitation personnel, and all staff of medical institutions (pre-inspection and triage, fever clinic, isolation ward, nucleic acid sampling). The 2-day 1-inspection personnel include employees in catering places, two stations, one dock and urban public transport (buses, subways, taxis, internet car rides, etc.), front-line staff in non-closed port management, key personnel such as pension institutions, children's welfare institutions, moon clubs, massage physiotherapy places, etc., who need to frequently enter crowded places (especially places where there are many tin visitors from other cities). All primary and secondary schools (including secondary vocational schools and technical schools) and kindergartens in the city carry out nucleic acid testing on the first day (usually Monday) and the fourth day (usually Thursday) of returning to school on weekends and holidays. The rest of the students in the above schools are required to carry out nucleic acid testing according to the sampling ratio of 21% of the whole school every day (21% per class every day). Strictly implement the daily zero nucleic acid test for key groups in the school such as teachers and security guards, school doctors, cleaning, boarding houses, catering services, and mail delivery.