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Is it OK to go out with COVID? Oregon led the nation in saying yes, now the CDC may follow
(www.oregonlive.com)
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They don't mutate for any purpose, that's just what happens over time. What direction it goes can vary with how the mutation affects survival. On average not killing a host works out better, but that doesn't imply that's a preferred path nor exclude a mutation that gets worse for the hosts as well as the disease.