But look fingerprints similar transition SARS2 , strange surprise awaits.The virus changed hardly , least recently.From first appearance , well adapted human cells.Researchers led Alina Chan Broad Institute compared SARS2 late stage SARS1 , well adapted human cells , found two viruses similarly well adapted. “ By time SARS-CoV-2 first detected late 2019 , already pre-adapted human transmission extent similar late epidemic SARS-CoV , ” wrote.Even think lab origin unlikely agree SARS2 genomes remarkably uniform.Baric writes “ early strains identified Wuhan , China , showed limited genetic diversity , suggests virus may introduced single source. ” A single source would course compatible lab escape , less massive variation selection evolution ’ hallmark way business .