Again: Viruses do not necessarily evolve to be milder—especially if they transmit early, like this one. Our immune system learning about it—via vaccines or infection—can mean better response next time, so milder experience. Not same as virus becoming intrinsically less virulent.https://twitter.com/zeynep/status/1465075561236250631 …
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No, this doesn't make sense. There is no intrinsic trade-off mechanism between the two, and situations where both can and do go up, like Delta. And the virus doesn't "care" if it eventually kills its host as long as it is spreading.https://twitter.com/PrinzMidas/status/1468228080024137737 …
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SARS-CoV-2 transmits early in the disease course, sometimes before symptoms, and severe illness and death comes much, much later, *after* the most infectious period. "Milder" to vaccinated or previously infected people is different than "it became intrinsically less virulent."
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Plus even if it is more lethal than delta on an uninfected individual, Delta burned so hot that one wonders how many unvaxxed and never infected people are left?
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And just because something is being selected for doesn’t mean it will happen. Mutations are random and incremental. Chance plays a major role.
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