Legal basis: Article 2 of the Notice of Shanghai Municipal Office of Prevention and Control on Consolidating the Achievements of Epidemic Prevention and Control implements strict community health management for 14 days for all people who come to Shanghai or return to Shanghai through medium-risk areas, and carries out COVID-19 nucleic acid detection twice; All personnel who come to Shanghai, return to Shanghai from the middle-risk area or pass through the middle-risk area should report to their village committees and units (or hotels) as soon as possible after arriving in Shanghai and within 12 hours.