The ongoing pandemic of coronavirus disease 2019 poses a great threat to human beings.Although numerous patients have recovered,re-positive cases have been reported in several countries.Till now,we still know very little about the disease and its pathogen severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).Therefore,more attention should be paid to the following aspects,such as postdischarge surveillance,asymptomatic infection,re-evaluation of influenza-like symptoms,and dynamic monitoring of genomic mutation of SARS-CoV-2.