The city reported 1,931 locally transmitted COVID-19 cases and 15,698 local asymptomatic infections on Thursday, said the Shanghai Health Commission on Friday morning.Of all the local infections, 143 confirmed patients were previously asymptomatic infections. Another 1,685 confirmed patients and 15,551 asymptomatic cases were detected during central quarantine, while the rest were found in the screening of high-risk people.1,931 local casesThe first 1,685 patients tested positive during central quarantine.