Don't viral research labs use pseudo viruses to study their functions?<br><br>Also, most coronaviruses have furin cleavage sites. Guess what. Viruses need to enter cells to replicate lol.<br><br>The furin cleavage site in the SARS-CoV-2 spike protein is required for transmission in ferrets | Nature Microbiology<br><br>Holy shit. The chinese leaked the virus to intentionally wipe out ferrets!,(reply>), "there had been four incidents of SARS-related lab breaches since 2004, two occuring at a top laboratory in Beijing. Due to overcrowding there, a live SARS virus that had been improperly deactivated,"