The city reported 1,661 locally transmitted COVID-19 cases, 15,319 local asymptomatic infections and 52 deaths on Monday, said the Shanghai Health Commission on Tuesday morning.Of all the local infections, 968 confirmed patients were previously asymptomatic infections. Another 675 confirmed patients and 15,120 asymptomatic cases were detected during central quarantine, while the rest were found in the screening of high-risk people.1,661 local casesThe first 675 patients tested positive during central quarantine.