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Alien Cells May Explain COVID ‘Brain Fog’ – Medscape
The brain fog often linked to COVID-19 may be linked to the presence of bone marrow cells in brain capillaries, new findings suggest.

The long-term neurologic symptoms such as “brain fog” experienced by some patients with COVID-19 may be caused by a unique pathology the occlusion of brain capillaries by large megakaryocyte cells, a new report suggests.
The authors report five separate post-mortem cases from patients who died with COVID-19 in which large cells resembling megakaryocytes were identified in cortical capillaries. Immunohistochemistry subsequently confirmed their megakaryocyte identity.
They point out that the finding…
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