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Even if you're fully vaccinated, or as fully vaccinated as current tech permits, https://www.thelancet.com/journals/eclinm/article/PIIS2589-5370(21)00324-2/fulltext is of interest. They find guaranteed cognitive deficits due to COVID infection. And yes, 100% anything in biology is a big red flag. But there's another one -- https://www.medrxiv.org/content/10.1101/2021.06.11.21258690v2 -- which, yes, preprint, but they use the baseline for a big longitudinal study to find that you've got guaranteed brain tissue loss from COVID. So perhaps they're not finding the truly mild cases; perhaps a certain percentage of the population is for reasons of genetic luck immune to these effects. Perhaps larger studies would provide greater resolution and nuance. But for now, for risk assessment purposes, I think it would be prudent to consider these two papers likely to be substantially correct.

That's not actually the scary stuff; the scary stuff is https://www.biorxiv.org/content/10.1101/2021.02.23.432474v2 which finds universal Lewy body formation in a macaque model post-COVID. (Lewy-body dementia is fatal, even less well understood than Parkinson's, and at the present state of the art they can only detect Lewy bodies via specialised work post-mortem.) If that holds in humans -- a very large if, but one to which we cannot attach any present facts -- the 10 year mortality rate of COVID is plausibly 100%.

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