[dwd]

I think (so this is a personal theory) what we are seeing is that a version was circulating earlier that was highly contagious. It got to Wuhan and maybe through an accidental cross-infection, potentially an individual working at the lab, inherited some RNA to mutate into something far more deadly.

What no one is saying is how the earlier version differed, but was obviously not killing that many people or we would have heard about it. Anecdotally there was just a spike in hospital pneumonia cases.