“…4 Could the acute and subacute description of 'COVID fog' actually be a form of delirium? Cognitive deficits impact cortical and subcortical domains, including episodic and working memory, executive function and, of particular note, attention and speed of processing, 5 which are key impairments seen in delirium. The onset of cognitive changes related to COVID-19 is typically acute or subacute, another feature of delirium.…”