[mdp2021]

It is in articles, and you will not have difficulties in finding anecdotal evidence. Of course, it will depend on the definition. It should be normal to believe that some can suffer semipermanent damages; it is more urging to assess and define the more subtle ones, for mild cases.

It is not clear (to some who follow the matter reasonably in their time) how permanent the damage will be, but for example the first article that results to a search, the "famous" recent "similar in magnitude to the effects of ageing between 50 and 70 years of age",

https://www.sciencedirect.com/science/article/pii/S258953702...

mentions 10 IQ points lost in a number of patients months after hospitalization... They note: «it is very possible that some of these individuals will never fully recover».