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To the Editor:rnCoronavirus disease 2019(COVID-19)is a global epidemic caused by the infection of severe acute respiratory coronavirus 2(SARS-CoV-2)and its mortality rate was up to 20 times higher than that of influenza.The virus is infectious,strange and variable.The treatment of it must be urgent and targeted.It is not enough to wait for a vaccine available to contain and prevent its spreading,we need to take all kinds of feasible measures to deal with the severe challenge from the virus transmission and mutation.