> . it has a "weird" furin cleavage site on its spike protein, where "weird" means: From what I know that is unusual but not rally that unusual or weird. > SA

> . it has a "weird" furin cleavage site on its spike protein, where "weird" means: From what I know that is unusual but not rally that unusual or weird. > SARS-CoV-19 doesn't have a direct predecessor virus Us not knowing a "close by/directish" predecessor is also not uncommon for a virus which jumped from wield animals to humans. It's a different thing if it's a virus which was a well known one already spread in humans or human cattle/pets and then mutated. But if you look at the wield there are viruses which survived for decades e.g. in bat colonies with some small mutations here and there, for that example case it would be very strange if we would know a predecessor with might already have gone extinct... And similar thinks might very well apply to SARS-Cov-2.