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If your really interested in whether virus's mutate towards a more virulent variant I recommend you do some reading. An excellent book is "Viruses, Plagues & History by Michael B.A. Olstone, published in 2010 by Oxford Press, Chapter 2, page 10 gives an excellent explanation "perhaps some viruses stayed within the parental host from which they evolved and displayed symbiotic or near-symbiotic relationships. But as viruses moved from one host species to another or mutated to form new genetic mixtures, some of these formerly symbiotic viruses achieved a high level of virulence." I use it as a reference book for doing my family genealogy. Over the centuries many of my ancestors suffered through viruses, plagues etc. So yes, I believe the Delta Variant is the virus's way of staying alive. That's their purpose. So get your vaccination, mask up and never underestimate what science can teach us.