Spronk, Inge, Brus, Iris M, de Groot, Annemieke et al. · Epidemiology and infection · 2023 · DOI
This study followed 368 people who developed fatigue and other health problems after Q-fever infection and checked in with them over 10+ years later. Patients reported numerous ongoing complaints, significantly reduced quality of life, severe fatigue, and worsening symptoms after physical activity. Younger and middle-aged patients experienced worse health outcomes than older patients, suggesting that age may affect how Q-fever fatigue syndrome impacts long-term health.
ME/CFS and QFS share core features including post-exertional malaise and severe fatigue persisting years after illness onset. This study provides long-term real-world evidence that infection-triggered fatigue syndromes cause sustained, substantial disability across multiple health domains, supporting the need for age-stratified clinical management and validating patient experiences of persistent, debilitating symptoms.
This observational study cannot establish causation or explain why older patients report better outcomes—selection bias, survival bias, or reporting differences may play a role. The study does not compare QFS directly to ME/CFS or other fatiguing illnesses, limiting generalizability. Cross-sectional assessment at a single timepoint cannot determine whether outcomes improved, worsened, or plateaued over the 10+ year period.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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