...I’ve also read (no, I lost the link) that they’ve detected differences in the isolated virus in later cases.
I am off to bed but here’s some good stuff for you...
https://www.mdpi.com/1999-4915/8/6/154/htm
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)30185-9/fulltext
And maybe I’ll catch you tomorrow late.