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by lelanthran 799 days ago
> How do you know for sure that the control group didn't get COVID.

I dunno if that is relevant - it's the symptoms (brain inflammation[1]) that is hypothesised to correspond with lower cognitive function.

Even if you did have COVID, but didn't get brain inflammation[1], you can still serve as a control.

[1] I say "brain inflammation"; the exact mechanism is explained by a comment upthread.