> Also, we should forever be thankful that such a mild version of the coronavirus mutated a structural upgrade like the furin cleavage site. If this had happene

> Also, we should forever be thankful that such a mild version of the coronavirus mutated a structural upgrade like the furin cleavage site. If this had happened with SARS, MERS, or a hemorrhagic fever it could have been real trouble. would you mind elaborating, because i don't understand or follow this. what is the relevance of mutating a "structural upgrade like the furin cleavage site"? forgive my lack of biology, but i both don't understand what this means nor its relevance. in "if this had happened with...", what is "this"? if it is the current coronavirus outbreak, isn't the current one much worse because it is more mild than sars?