home isolation. With the adjustment of epidemic prevention and control policies in Nantong, COVID-19-positive people should be isolated at home in principle. Home isolation medical observation (referred to as home isolation for short) refers to medical health management for close contacts and special people in close contact, entry personnel who implement "14+7", patients who are discharged from hospital and asymptomatic infected people who are released from isolation, and other personnel who are unable to carry out centralized medical observation after professional evaluation.