The virus already well adapted humans , expected virus grown humanized mice.It possessed unusual enhancement , furin cleavage site , possessed known SARS-related beta-coronavirus , site included double arginine codon also unknown among beta-coronaviruses.What evidence could want , aside presently unobtainable lab records documenting SARS2 ’ creation ? Proponents natural emergence rather harder story tell.The plausibility case rests single surmise , expected parallel emergence SARS2 SARS1 MERS.But none evidence expected support parallel history yet emerged.No one found bat population source SARS2 , indeed ever infected bats.No intermediate host presented , despite intensive search Chinese authorities included testing 80,000 animals.There evidence virus making multiple independent jumps intermediate host people , SARS1 MERS viruses .