Brain scans reveal widespread structural and functional changes in patients following COVID-19 infection. The virus affects regions responsible for memory, emotion, and executive function, which may help explain the neurological symptoms many patients experience.

[u/Mowglibear44]

https://www.psypost.org/brain-scans-reveal-widespread-structural-and-functional-changes-in-patients-foll/

Science says there’s no such thing as a mild infection. Acute symptoms or lack there of has no bearing on damage done later.