The city reported 358 locally transmitted COVID-19 cases, 4,144 local asymptomatic infections, seven imported patients and one imported asymptomatic case on Thursday, said the Shanghai Health Commission on Friday morning.Of all the local infections, 20 confirmed patients are previously asymptomatic infections. Eight confirmed patients and 3,710 asymptomatic cases were detected during central quarantine, while the rest were found in the screening of high-risk people.358 local casesThe first eight patients tested positive during central quarantine.