Study on 61 men MRI scanned pre and post omicron covid. "Decrease in gray matter thickness in the left precuneus and right lateral occipital regions of the brain. Ratio of the right hippocampus volume to total brain volume decreased."

Average age of man in study: 43

UK researchers scanned the brains of 400 people before and after mild covid, compared them with controls and found:

1. greater reduction in grey matter thickness
2. greater reduction in global brain size
3. greater cognitive decline
4. greater change to primary olfactory cortex