The Chinese mainland on Thursday reported 5,646 locally transmitted confirmed COVID-19 cases, of which 5,487 were in Shanghai, according to the National Health Commission's report Friday.Of all the newly reported local confirmed cases, 5,125 were previously identified as asymptomatic infections.The Chinese mainland on Thursday reported 5,646 locally transmitted confirmed COVID-19 cases, of which 5,487 were in Shanghai, according to the National Health Commission's report Friday.Of all the newly reported local confirmed cases, 5,125 were previously identified as asymptomatic infections.