When 24 patients who had recovered from COVID-19 had their whole bodies scanned by a PET (positron emission tomography) imaging test, their insides lit up like Christmas trees.

A radioactive drug called a tracer revealed abnormal T cell activity in the brain stem, spinal cord, bone marrow, nose, throat, some lymph nodes, heart and lung tissue, and the wall of the gut, compared to whole-body scans from before the pandemic.

This widespread effect was apparent in the 18 participants with long COVID symptoms and the six participants who had fully recovered from the acute phase of COVID-19.

Add it to the pile of evidence