Patients with LC had highly activated innate immune cells, lacked naive T and B cells and showed elevated expression of type I IFN (IFN-β) and type III IFN (IFN-λ1) that remained persistently high at 8 months after infection.
Immunological dysfunction persists for 8 months following initial mild-to-moderate SARS-CoV-2 infection - Nature Immunology
Phetsouphanh and colleagues show that individuals with long COVID have persistent activation of the innate and adaptive immune system at 8 months after infection and define a set of analytes associated with long COVID.www.nature.com
A Longitudinal Study of COVID-19 Sequelae and Immunity: Baseline Findings | Annals of Internal Medicine
Background: A substantial proportion of persons who develop COVID-19 report persistent symptoms after acute illness. Various pathophysiologic mechanisms have been implicated in the pathogenesis of postacute sequelae of SARS-CoV-2 infection (PASC). Objective: To characterize medical sequelae and...
www.acpjournals.org
A high burden of persistent symptoms was observed in persons after COVID-19. Extensive diagnostic evaluation revealed no specific cause of reported symptoms in most cases.
They threw every test (blood tests, CT scans, etc) they could at people and couldn't find anything. Everything has bio-psycho-social aspects to it, it looks like long covid has no bio associated aspect to it.