Study from CAMH found, via PET scans, elevated levels of the protein TSPO, a brain marker of inflammation, in patients with onset of depression in long covid

more than 200 million globally may experience lingering neurological symptoms from COVID, including depression, memory impairment, slower motor control, low motivation and energy, for months to even years due to brain inflammation from long COVID

this along side everything we have learned in the last 2.5 years ( much summarized in the lit review done by Stanford and Yale, linked in the comments ) moves us a step closer in understanding the underlying biological mechanisms behind these symptoms