For months I've been seeing reports of cognitive issues arising as a direct result of Coronavirus infection. This "brain fog" is said to persist for a significant period of time after the conventional symptoms of coronavirus subside. Anyone have some insight as to the mechanism behind this? Furthermore, how permanent can it be?

https://www.cuimc.columbia.edu/news/even-mild-cases-can-cause-covid-19-fog

https://www.cdc.gov/coronavirus/2019-ncov/long-term-effects.html

Retardvirus?