The city reported 261 locally transmitted COVID-19 cases, 4,390 local asymptomatic infections, two imported cases and 13 deaths on Wednesday, said the Shanghai Health Commission on Thursday morning.Of all the local infections, 185 confirmed patients were previously asymptomatic infections. Another 75 confirmed patients and 4,357 asymptomatic cases were detected during central quarantine.261 local casesThe first 75 patients tested positive during central quarantine.