# Differential Characteristics and Comparison Between Long-COVID Syndrome and Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS)

## TL;DR

This paper compares Long-COVID and ME/CFS, highlighting their similarities and differences in symptoms, causes, and treatments.

## Contribution

The paper provides a comparative analysis of Long-COVID and ME/CFS, emphasizing the need for more research on immune dysfunction.

## Key findings

- Both Long-COVID and ME/CFS involve immune dysregulation and similar symptoms like fatigue and cognitive issues.
- Graded exercise therapy is controversial, with a focus on individualized pacing and multidisciplinary approaches.
- More research is needed to identify common and unique mechanisms for better therapies and diagnostics.

## Abstract

Long-COVID and Myalgic Encephalomyelitis/Chronic Fatigue Syndrome are disabling diseases characterised by ongoing fatigue, post-exertional malaise, cognitive impairment, and autonomic dysfunction. Myalgic Encephalomyelitis/Chronic Fatigue Syndrome typically follows viral infections, whereas Long-COVID exclusively follows SARS-CoV-2 infection, with overlapping but distinct features. This review uses comprehensive searches of online databases to compare their clinical presentations, pathophysiologies, and treatments. Both Long-COVID and ME/CFS appear to involve multifactorial mechanisms, including viral persistence, immune dysregulation, endothelial dysfunction, and autoimmunity, though their relative contributions remain uncertain. Symptom management strategies are consistent, however. Cognitive behaviour therapy has been successful, and there are minimal drug treatments. Graded exercise therapy occupies a contested place, recommending individualised pacing and multidisciplinary rehabilitation. Common and exclusive mechanisms must be identified to formulate valuable therapies. A more significant body of research focusing on immune dysfunction as a pathogenic mechanism for advancing the disease and enabling more effective therapies and diagnostics is needed.