PROLONGED COVID SYMPTOMS (‘LONG COVID’) AFFECTING BRAIN AND OTHER FUNCTIONS. In a recent German study, at 12 months after onset of Covid symptoms, only 22.9% of people were completely free of symptoms. [because of ‘selection bias’ in the study – see below* – the percentage of people without long covid symptoms at 12 months is likely to be less than 22.9%] Most frequently reported symptoms were: reduced exercise capacity (56.3%), fatigue (53.1%), breathlessness (37.5%), concentration problems (26.0%), problems finding words…..