There's a natural boundary between humans and animals, in the sense that animal viruses don't infect humans that easily and vice-versa. If left to nature, viruses take some time to mutate. It does not naturally mutate that fast. At least, that was the way BEFORE the covid-19 pandemic.
That's the problem when people try to interfere with nature by doing experiments in labs. Today I saw one video in Youtube reporting about some scientists doing human chimera research. That's basically a cross between humans and animals. That's terrible and one of those early signs that in the future, there may be even worse catastrophe befalling humans than the current covid-19 pandemic.
I pray that humans come to their senses and STOP interfering with nature!