The city reported 234 locally transmitted COVID-19 cases, 2,780 local asymptomatic infections, three imported asymptomatic infections and six deaths on Monday, said the Shanghai Health Commission on Tuesday morning.Of all the local infections, 156 confirmed patients were previously asymptomatic infections. Another 78 confirmed patients and 2,775 asymptomatic cases were detected during central quarantine.234 local casesThe first 78 patients tested positive during central quarantine while the rest 156 patients used to be asymptomatic infections.