The city reported 50 locally transmitted COVID-19 cases, 3,450 local asymptomatic infections, ten imported patients and four imported asymptomatic cases on Sunday, said the Shanghai Health Commission on Monday morning.Of all the local infections, 17 confirmed patients and 2,833 asymptomatic cases were detected during central quarantine, while the rest were found in the screening of high-risk people.50 local casesThe first 17 patients tested positive during central quarantine. The rest 33 tested positive in the screening of high-risk people.