“ We said , ‘ Let ’ take theory — multiple different versions — virus non-natural origin … serious potential hypothesis , ’ ” Andersen says.Meeting via Slack virtual portals , researchers analyzed virus ’ genetic makeup , RNA sequence , clues origin.It clear “ almost overnight ” virus ’ human-made , Andersen says.Anyone hoping create virus would need work already known viruses engineer desired properties.But SARS-CoV-2 virus components differ previously known viruses , come unknown virus viruses nature. “ Genetic data irrefutably show SARS-CoV-2 derived previously used virus backbone , ” Andersen colleagues write study. “ This virus somebody would conceived cobbled together.It many distinct features , counterintuitive , ” Garry says. “ You ’ trying make deadly virus. ” Other scientists agree .