A preliminary study of brain imaging taken of before COVID-19 infection and after showed a reduced amount of gray matter thickness in the frontal and temporal lobes. This seems to explain some of the symptoms like loss of smell and taste (associated with the olfactory bulb) as well as other side effects like memory loss.
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14% of US Adults Have Had Long Covid
A Household Pulse Survey (HPS) found that more than 14% of US adults have or had Long COVID. Across all age groups, the 40-49 year old had the highest percentage at 18.8%. This could indicate a staggeringly large number of people will have lasting health issues due to COVID-19 and was a key contributer to the labor shortages in 2022.
COVID-19 Can Cause Brain Damage and Cause Neurological Symptoms
A paper published in Nature looked at brain autopsies of people that died from COVID-19. Brain endothelial cells were found to be infected and there was an increase in string vessels (lost capillaries).