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The persistence of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) after SARS-CoV-2 infection: A systematic review and meta-analysis.

Dehlia, Ankush, Guthridge, Mark A · The Journal of infection · 2024 · DOI

Quick Summary

Researchers looked at studies of people with Long COVID to see how many also meet the diagnostic criteria for ME/CFS. They found that about half of Long COVID patients have symptoms that match ME/CFS, including severe fatigue, sleep problems, muscle and joint pain, and post-exertional malaise (feeling much worse after physical activity). This suggests that Long COVID and ME/CFS may be very similar conditions, at least in some patients.

Why It Matters

This study helps clarify the relationship between Long COVID and ME/CFS, suggesting they may represent overlapping conditions or that Long COVID can trigger ME/CFS in some patients. Understanding that half of Long COVID patients may have ME/CFS could improve clinical recognition, treatment approaches, and ensure affected patients access appropriate supportive care and research opportunities designed for ME/CFS.

Observed Findings

  • Approximately 51% of Long COVID patients met diagnostic criteria for ME/CFS across included studies (95% CI: 42%-60%)
  • Fatigue, sleep disruption, and muscle/joint pain were the most commonly reported symptoms among LC patients
  • Post-exertional malaise, a hallmark ME/CFS symptom, was documented in Long COVID patient populations
  • Analysis included 13 eligible studies with a combined total of 1,973 Long COVID patients
  • Studies were published between January 2020 and May 2023, capturing early Long COVID research

Inferred Conclusions

  • Long COVID and ME/CFS exhibit substantial symptom overlap, with a substantial proportion of LC patients satisfying established ME/CFS diagnostic criteria
  • Current ME/CFS diagnostic frameworks could potentially be adapted to improve identification and standardized diagnosis of a subset of Long COVID patients
  • The similar symptom clustering and presence of post-exertional malaise in both conditions suggests potential shared pathophysiological mechanisms or overlapping disease processes
  • Improved diagnostic standardization could facilitate more consistent patient management and enable better recruitment for ME/CFS-focused clinical trials in the Long COVID population

Remaining Questions

  • Do Long COVID patients meeting ME/CFS criteria have identical underlying biological abnormalities and pathophysiology to ME/CFS patients with other viral etiologies?
  • How do symptom severity, disease trajectories, and long-term outcomes differ between Long COVID patients with and without ME/CFS?
  • What are the optimal adapted diagnostic criteria that should be used specifically for Long COVID-associated ME/CFS identification and clinical management?
  • Do treatment approaches effective for classic ME/CFS provide similar benefits in Long COVID patients meeting ME/CFS criteria?

What This Study Does Not Prove

This study does not prove that Long COVID causes ME/CFS, only that the symptom clusters overlap significantly. It also does not establish whether the underlying biological mechanisms in Long COVID-associated ME/CFS are identical to ME/CFS from other viral triggers. The analysis is limited by variations in how ME/CFS was diagnosed across different studies and does not account for potential differences in symptom severity or disease progression.

Topics

Sleep DysfunctionPost-Exertional Malaise

Tags

Method Flag:PEM_DEFINEDMixed CohortStrong Phenotyping
Symptom:Post-Exertional MalaiseUnrefreshing SleepPainFatigue
Phenotype:Infection-TriggeredLong COVID Overlap

Metadata

DOI
10.1016/j.jinf.2024.106297
PMID
39353473
Review status
Editor reviewed
Evidence level
Established evidence from major reviews, guidelines, or evidence maps
Last updated
7 April 2026