TheSARS-CoV-2isanenvelopedβ-coronavirus,circularorellipticalparticlediameterofabout60~140nm,oftenpleomorphic,obviouslydifferentfromSARS-CoVandMERS-CoVingeneticcharacteristics.Themainclinicalmanifestationsincludefever,fatigueandothersystemicsymptoms,accompaniedbydrycough,dyspnea,etc.,whichcanrapidlydevelopintoseverepneumonia,respiratoryfailure,acuterespiratorydistresssyndrome,septicshock,multi-organfailure,severeacid-basemetabolismdisorder,andevenlife-threatening.SARS-CoV-2hasbeenidentifiedasthemainmeansoftransmissionthroughrespiratorydroplets(sneezing,coughing,etc.)andcontact(pickingnostrilwiththehandincontactwiththevirus,rubbingeyes,etc.).SARS-CoV-2issensitivetoultravioletrayandheat,andcanbeinactivatedat56℃for30minutesandbyfatsolublesolventsuchasethylether,75%ethanol,chlorinedisinfectant,peraceticacidandchloroform.