> The infected group also displayed a 0.2%-to-2% greater reduction in brain size compared with those who hadn’t been infected and showed greater cognitive decline based on their performance undertaking complex tasks. This was associated with atrophy, or shrinkage, in a specific part of the cerebellum -- an area at the back and bottom of the brain -- linked to cognition. Differences between infected and non-infected participants was more marked in older people.<p>I was always under the impression that grey matter can rebound with time. For smokers, after they quit they would increase their grey matter over a couple years. The same for those who work out regularly, they increase the amount of grey matter. Let alone consuming mushrooms like lion's mane which also helps. So long as the virus is completely eradicated from the body, one would begin to recover. Severe cases and long covid might be another story though.