Fatigue and symptom-based clusters in post COVID-19 patients: a multicentre, prospective, observational cohort study.
Cornelissen, Merel E B, Bloemsma, Lizan D, Vaes, Anouk W et al. · Journal of translational medicine · 2024 · DOI
Quick Summary
This study followed 95 Dutch patients with long COVID for up to 18 months after their initial SARS-CoV-2 infection. Most patients experienced persistent fatigue, along with sleep problems, pain, and cognitive difficulties. Interestingly, over half of these patients met the diagnostic criteria for ME/CFS, and their symptom patterns resembled those seen in people with ME/CFS.
Why It Matters
This study is significant because it demonstrates that post-COVID-19 condition shares substantial clinical and symptomatic overlap with ME/CFS, suggesting common pathophysiological mechanisms. Understanding these connections may accelerate research into both conditions and inform diagnostic and management strategies for patients experiencing prolonged fatigue and multi-system symptoms.
Observed Findings
Fatigue (FSS ≥4) was present in 75.9% of patients at 3-6 months post-infection and 57.1% at 9-12 months.
Post-exertional malaise, sleep disturbances, pain, and neurocognitive symptoms were frequently reported alongside fatigue.
52.7% of post-COVID patients met Fukuda criteria for ME/CFS diagnosis.
Post-COVID patients distributed across 11 of 337 previously identified ME/CFS symptom clusters.
Two symptom clusters contained more than 10 post-COVID patients each, suggesting common presentations.
Symptom heterogeneity within post-COVID populations mirrors the diversity observed in ME/CFS cohorts, indicating distinct disease subtypes may exist in both conditions.
The prevalence of fatigue and post-exertional malaise in post-COVID patients warrants consideration of ME/CFS diagnostic criteria in clinical assessment protocols.
Remaining Questions
Do post-COVID patients and ME/CFS patients share common biological mechanisms, or do similar symptoms arise from different underlying pathologies?
What determines which patients develop persistent symptoms versus those who recover, and are there predictive biomarkers or clinical features that identify risk?
What This Study Does Not Prove
This study does not prove that post-COVID-19 and ME/CFS are identical conditions or share the same underlying causes—only that symptom patterns overlap. The observational design cannot establish causality or explain why some individuals develop these symptoms while others recover. Results may not generalize to younger patients, older patients, or populations outside the Netherlands.