The city government is seeking to further optimize the definition of COVID-19 close contacts with scientific judgement while avoiding "\\;simplistic sweeping measures,"\\; according to the Shanghai Health Commission.The daily COVID-19 prevention meeting of the city government on Sunday called for more efforts to be put into epidemiological surveys and source tracking to find the origin of risks and cut community transmission.Meanwhile, appeals from residents must be heard patiently and their difficulties must be solved with all-out efforts, Zhao Dandan, deputy director of the commission, insisted.