“ small study, which was published in the journal Nature Neuroscience, analyzed blood samples—specifically, serum and plasma—from 76 patients who were hospitalized with COVID-19 in March or April 2020, along with those from 25 people taken before the pandemic. The researchers discovered that people who said they had brain fog had higher levels of a protein in their blood called S100β than people who didn’t have brain fog.” https://www.prevention.com/health/health-conditions/a60255042/long-covid-brain-fog-leaky-blood-vessels-study/
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