Secrets of “Covid Brain Fog” are starting to lift (

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Precise Science

Instead of “Brain Fog” from Covid, we can now say “a loss of oligodendrocytes” and “microglial reactivity” are causes of decreased memory, cognitive sharpness and fatigue post Covid infection.

I love that our smart scientist colleagues are linking out to the chemotherapy and other viral research literature to find common threads and discover the basis for such puzzling syndromes.


I DON’T love the ongoing Covid infection numbers, the lack of masking, the decrease in vaccinations, as about 20 to 50% of all new Covid infections develop into forms of Long Covid, with Brain Fog being a long-term common symptom.

Even as the risk of hospitalizations fall with the latest Covid variant, the risk of Long Covid has not. We should all be concerned about this. Stay safe out there, colleagues. We need your brain power.

Author: CT Lin

CMIO, UCHealth (Colorado); Professor, University of Colorado School of Medicine

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