Parker, Neil R, Barralet, Jennifer H, Bell, Alan Morton · Lancet (London, England) · 2006 · DOI
Q fever is an infection spread from animals to humans that usually causes flu-like symptoms, pneumonia, and liver inflammation. While most people recover on their own, some develop serious heart infections or long-term complications including chronic fatigue syndrome. This review describes Q fever's various presentations and available vaccines, with notes that awareness and symptoms vary by region.
This review is significant for ME/CFS research because it documents an infectious trigger (Q fever) with post-infectious chronic fatigue syndrome as a recognized sequela, providing clinical evidence that infections can lead to long-term fatigue states. Understanding Q fever-related chronic fatigue may inform mechanistic pathways relevant to ME/CFS pathogenesis and post-infectious illness recovery.
This review does not establish the prevalence or mechanisms by which Q fever causes chronic fatigue syndrome, nor does it prove that Q fever is a common cause of ME/CFS. It also does not provide controlled comparisons between Q fever-related fatigue and other forms of ME/CFS, and the cited evidence of chronic sequelae comes from geographically limited studies of unspecified design.
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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