Among the 6 confirmed cases, 2 were asymptomatic patients who had been admitted to the Municipal Public Health Clinical Center, and 4 were found during centralized isolation and control; among the 55 asymptomatic infections, 44 were in the centralized It was found in the isolation control, and the rest were found by screening of relevant risk groups, and all of them have been sent to the Shanghai Public Health Clinical Center for isolation treatment or isolation medical observation.