The city reported 3,200 locally transmitted COVID-19 cases, 19,872 local asymptomatic infections and one imported asymptomatic patient on Thursday, said the Shanghai Health Commission on Friday morning.Of all the local infections, 307 confirmed patients were previously asymptomatic infections. Another 2,547 confirmed patients and 19,494 asymptomatic cases were detected during central quarantine, while the rest were found in the screening of high-risk people.3,200 local casesThe first 2,547 patients tested positive during central quarantine.