paperscissorsrock
“Yes, but by comparison, this arose with ~17 mutations all in one go. This is unusual and worrying.
Is there a precedence for this to happen? How would there be so many mutations in one go?”
This is the first one with so many mutations in one go that has survived.
The leading hypothesis right now is that it arose in an immunocompromised patient who had it chronically. They couldn’t shift the virus so it just went through a lot of replications and evolved to “escape” whatever immuno response the patient could mount.
This gave it a lot of opportunities to develop mutations at multiple sites.
The worry now is that when you have an extremely infectious form of a virus which is running rapidly through a population, it has more and more opportunities to mutate.