Think about this. Wouldn’t every virus morph into something unrecognizable to our immune system? All of this hype is about something very different than what occurs in nature, or it is exaggerated and distorted information. It just doesn’t happen naturally.
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Well, this is more of a traditional answer, but not every virus replicates the same way and I would guess this determines to a large degree to what degree mutations are likely.
Generally, when copying RNA more mistakes are made, because it is a single strand. DNA has two strands and they are their genetic opposites, which allows for mistakes to be corrected.
Some viruses are DNA viruses, but for instance measles is an RNA virus. However, there are other properties, such as packaging that determine properties involved in mutation. Also, if you look at known measles viruses, there are a handful of strains with 24 variations or so.
I think the good thing about measles is that our immune-systems can deal with all of these types before it ever comes to a mutation. The virus has simply lost the battle. Vaccinations may have helped, but I think general hygienic practice has done at least as much.
Chicken pox is a DNA virus, which per definition would not mutate as much.