Shanghai reported four locally transmitted COVID-19 cases with mild symptoms and 34 local asymptomatic cases on Monday afternoon.All the new and asymptomatic cases tested positive after being centrally quarantined or screened as close contacts of previous cases, according to Lu Taohong , deputy director of the Shanghai Health Commission.The new local cases, aged between eight and 33 years, have been sent to the Shanghai Public Health Clinical Center for treatment or quarantined medical observation, Lu told a press briefing on Monday. They are residents of Huangpu, Minhang and Songjiang districts as well as the Pudong New Area, and all are in stable condition.