Director for the Center for Healthy Aging Research at the Rutgers Institute for Health, Dr William Hu is a cognitive neurologist: he studies and treats patients whose thinking is affected by disease.

Typically Dr Hu was dealing with Alzheimer's and related dementias in patients who were cognitively ageing whilst otherwise healthy, and those whose cognition was affected by their illness such as HIV or MS.  But since the Covid pandemic began, Dr Hu started seeing large numbers of patients whose ‘brain fog’ was sufficiently severe that they suspected they had early onset Alzheimer's, along with those who knew that their cognition, memory and thinking had demised to a degree that they were aware of it, but standard testing was inconclusive.

In this week’s episode we discuss the way in which Hu and his team at Rutgers used brain imaging and analysis of cerebrospinal fluid (CSF), which enabled them to identify changes in the brain of patients with brain fog.  Their study, published in Cell, revealed that they could see that these patients had the markers of persistently activated immune function in the brain.  Whilst they were unable to detect SARS CoV-2 virus in the CSF, their findings correlate with the theory that those with Long Covid have viral persistence, and they were also able to see that this brain activation was no longer present in those that recovered.

We talk through the implications of these findings for treatment and research into other chronic conditions, and discuss methods that might assist the immune system in recovering from these cognitive impairments and alleviate symptoms.  And reassuringly, Hu’s ideas involve trials in treatments that already have FDA approval for other conditions, meaning perhaps resolution is not so far out of reach.

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