How is it you can keep mutating and still be the same deadly virus?

In case you are wondering what happened to me:

I got a substitute teaching job... despite parking in the snow lane and having to move my car during my job interview, as well as looking like a crazy drug addict

I had pink eye for 4 months! (hence the drug addict chic look)

I lined up a zillion concerts for this summer.... best summer ever really

I guess that's it

Sad