Journal
VIRUSES-BASEL
Volume 15, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/v15020400
Keywords
long COVID; autoimmunity; myalgic encephalomyelitis; chronic fatigue syndrome (ME; CFS); viral reactivation; EBV; HHV-6; gut microbiota
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Long-haul COVID, also known as long COVID, is a novel syndrome that occurs in a significant percentage of individuals a few months after being infected with SARS-CoV-2. It is characterized by persistent, recurring, or new symptoms that affect various tissues and organs. There are similarities between long COVID and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), with infections, immune dysregulation, and inflammation playing a role in both conditions.
A novel syndrome called long-haul COVID or long COVID is increasingly recognized in a significant percentage of individuals within a few months after infection with SARS-CoV-2. This disorder is characterized by a wide range of persisting, returning or even new but related symptoms that involve different tissues and organs, including respiratory, cardiac, vascular, gastrointestinal, musculo-skeletal, neurological, endocrine and systemic. Some overlapping symptomatologies exist between long COVID and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). Very much like with long ME/CFS, infections with herpes family viruses, immune dysregulation, and the persistence of inflammation have been reported as the most common pattern for the development of long COVID. This review describes several factors and determinants of long COVID that have been proposed, elaborating mainly on viral persistence, reactivation of latent viruses such as Epstein-Barr virus and human herpesvirus 6 which are also associated with the pathology of ME/CFS, viral superantigen activation of the immune system, disturbance in the gut microbiome, and multiple tissue damage and autoimmunity. Based on these factors, we propose diagnostic strategies such as the measurement of IgG and IgM antibodies against SARS-CoV-2, EBV, HHV-6, viral superantigens, gut microbiota, and biomarkers of autoimmunity to better understand and manage this multi-factorial disorder that continues to affect millions of people in the world.
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