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EEG of two COVID-19 positive patients, both clinically alert and conscious but confused. (A) EEG of the first patient shows a disorganized alpha-theta background activity with frontal intermittent rhythmic delta activity (FIRDA). (B) EEG of the second patient, who in addition showed non-fluent aphasia, is characterised by monomorphic diffuse alpha-like rhythm without reactivity after eyes closure.
