I don't suppose anything prevents it from doing that, but consider this: Covid19 has infected billions of people. How many times has it mutated? A few hundred

I don't suppose anything prevents it from doing that, but consider this: Covid19 has infected billions of people. How many times has it mutated? A few hundred, I suppose, with only a few of those mutations having given rise to more infectious variants. That's a few out of billions of cases.