sciencedaily.com
Scientists thought brain inflammation was driving long COVID but the scans told a different story
Long COVID has often been suspected to involve ongoing inflammation in the brain caused by SARS-CoV-2 infection. Scientists have explored this theory as a possible explanation for symptoms such as fatigue, brain fog, anxiety, and depression. However, direct proof has remained limited. To investigate the issue more closely, researchers at the University of Turku in Finland used advanced brain imaging techniques to examine people with long COVID who continued to experience symptoms long after infection. "We did not observe evidence of widespread brain inflammation in patients with long COVID when compared to healthy controls," says Professor of Neuroimmunology and InFLAMES Research Flagship group leader Laura Airas, who led the study. Comparing Long COVID Patients With Healthy Volunteers and MS Patients The study included 14 people with long COVID, 11 healthy participants, and 13 individuals with multiple sclerosis (MS), a neurological disease known to involve inflammation in the brain. All participants underwent PET scans designed to detect neuroinflammation, along with magnetic resonance imaging (MRI) scans to evaluate brain structure and changes in white matter. Researchers also analyzed blood samples for biological markers associated with damage to neurons and supporting brain cells. Compared with patients who had MS, the long COVID group...