help form the blood-brain barrier, which keeps harmful substances from reaching the brain while allowing necessary substances to pass through. Damage to endothelial cells in blood vessels in the brain can lead to leakage of proteins from the blood. This causes bleeds and clots in some COVID-19 patients and can increase the risk of stroke.
The study builds on their previous research, which found evidence of brain damage caused by thinning and leaky blood vessels. They suspected that the damage may have been due to the body's natural inflammatory response to the virus. As in their earlier study, researchers found signs of leaky blood vessels, based on the presence of blood proteins that normally do not cross the blood brain barrier. This suggests that the tight junctions between the endothelial cells in the blood brain barrier are damaged.
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