They're just not going to give up.
https://ca.news.yahoo.com/explainer-scientists-alert-over-rising-130643664.html
The thing to keep in mind is: there are hundreds of thousands, if not millions of mutations or "variants". A mutation isn't some big red-letter event you put on your calendar, like a monster egg hatching into a man-eating monster. THAT would be a big deal each time it happens. Or each time a Godzilla-like monster split into two monsters or something, like an amoeba. That would be something to note.
But viruses are literally ALWAYS MUTATING. The only issue is: what is the mutation doing. How is it changing the virus' behavior.
And I'll give you another FACT of epidemiology (this isn't from me of course, I'm not one, but I've listened to several who taught me this)
Viruses tend to become LESS deadly over time, even if becoming more contagious. Remember, a virus doesn't pass itself on if the host dies within hours.
Yes, you do have epidemics and plagues like the Black Death. But note that they BURN THEMSELVES OUT eventually, as the population gets too thin, it stops spreading, and the survivors are naturally immune. There is ALWAYS a segment of the population that is immune to ANYTHING thrown at it. That's how wonderful God's immune system is. He programmed in a lot of variety, so the eggs are never all in one basket.
Man, being a drooling fool by comparison, does things like plant a whole crop of one variety (monoculture), such that a single insect, fungus, or rust comes along and wipes out THE ENTIRE CROP. Nothing in God's nature is that vulnerable.
Just remember that: nature wants viruses where you SURVIVE and pass on copies to as many people as possible, before the body's immune system destroys it.
So if something like the Bubonic Plague mutated, it would be in a LESS LETHAL direction, 100% of the time. Because for a bacterium, killing the host is a dysgenic trait -- less favorable to pass on one's genes.