The city reported 253 locally transmitted COVID-19 cases, 3,961 local asymptomatic infections, and 13 deaths on Friday, said the Shanghai Health Commission on Saturday morning.Of all the local infections, 175 confirmed patients were previously asymptomatic infections. Another 78 confirmed patients and 3,943 asymptomatic cases were detected during central quarantine.253 local casesThe first 78 patients tested positive during central quarantine while the rest 175 patients used to be asymptomatic infections.