Could the existing strains of coronavirus suddenly mutate and become apocalyptic?

Could the existing strains of coronavirus suddenly mutate and become apocalyptic?
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It would certainly appear that this has been the underlying risk from the outset and must remain so. I find it baffling that it has yet not dawned on so very many of us that this is the case. But one tenth of humanity sounds far fetched as a possibility. No pathogen in history has proven so globally lethal.
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