A systematic review of 49 imaging studies highlights how COVID-19 affects the human brain. Researchers found widespread structural and functional changes in areas responsible for memory, emotion, and attention, providing insight into enduring neurological symptoms like brain fog.
There are plenty of “harmless” viruses that we figured out later had horrible long term effects. Epstein-Barr/mono is probably one of them. Evidence is leaning towards it being the cause of Multiple Sclerosis.
It will be interesting to see what the results of future vaccinations for a lot of these turn out to solve.