I've seen several sources reporting that the B117 variant originated in a single immuno-suppressed individual who was being treated for cancer. Just read a long article about it here. www.wired.co.uk/article/chronic-infection-uk-coronavirus-variant
What can be done about this? Can patients who are on these therapies have them stopped if they contract Covid? Can they be isolated more effectively? It's a harsh line of thinking but it seems that keeping this man alive had led to thousands of other deaths, as well as fucking up the lives of millions of people, perhaps with lifelong consequences.
It's one thing if viruses mutate naturally. Not a lot we can do, and they usually become more infectious and less contagious. But it's frightening if high tech medicine for a tiny number of very sick people is going to keep this pandemic going almost indefinitely. The 'old' Covid would not have brought us to this situation.