An observational study on immunoadsorption in PCS and ME/CFS was the subject of Dr. Stein. In 10 patients* with ME/CFS after COVID-19, a reduction in autoantibodies in the blood was seen after repeated immunoadsorption and was associated with an improvement in physical functioning and a reduction in muscle pain and headaches. Less improvement was seen in fatigue and cognitive functioning. After a few months, however, patients’ overall condition worsened again to reach pre-treatment levels.