Anand, A C, Kumar, R, Rao, M K et al. · The Journal of the Association of Physicians of India · 1994
This study followed 87 patients who had a persistent low-grade fever (99-101°F) along with fatigue, muscle pain, and joint pain. Doctors ran many tests looking for infections, autoimmune diseases, or cancer, but found nothing abnormal. Most patients gradually improved over time, with about half becoming symptom-free within three years. The researchers suggest this condition might be related to ME/CFS.
This study contributes to understanding the diversity of ME/CFS presentations, particularly in patients whose primary complaint is low-grade fever rather than fatigue alone. It documents that extended viral-like illnesses with negative diagnostic workups and gradual recovery patterns may represent ME/CFS-related conditions, potentially broadening clinical recognition and reducing unnecessary investigations.
This study does not prove that low-grade pyrexia is definitively ME/CFS, nor does it identify the cause of either condition. The lack of control groups, absence of follow-up biomarkers, and observational design prevent causal conclusions. The voluntary recovery in over half of patients raises questions about whether all cases represent the same underlying condition.
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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