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Infectious Disease and Microbiology – Chronic Fatigue Syndrome
Chronic Fatigue Syndrome (CFS) is a heterogeneous disorder characterized by severe, persistent, and debilitating fatigue lasting at least six months. The fatigue is not relieved by rest and significantly interferes with daily functioning. In children, CFS is rare, but school absenteeism or withdrawal from normal activities should be monitored as indicators of functional impairment similar to adult disability.
The estimated prevalence in the United States ranges from 4.0 to 8.7 per 100,000 people, with a worldwide prevalence of approximately 0.6–1%. CFS is two to three times more common in women than in men. Ongoing research is evaluating potential genetic predispositions, but no specific genetic markers have been definitively linked to the disorder.
The pathophysiology of CFS remains uncertain. The etiology is unknown, although infectious triggers have been proposed. Associations with Epstein–Barr virus (EBV), cytomegalovirus (CMV), human herpesviruses, hepatitis C virus (HCV), Borrelia burgdorferi (Lyme disease), and Brucella species have been suggested but not conclusively proven. Immune dysfunction and abnormalities of the hypothalamic–pituitary–adrenal axis or autonomic nervous system have also been hypothesized. Depression and fibromyalgia are commonly associated conditions.
Diagnosis is clinical and remains one of exclusion. According to the 1994 CDC criteria, patients must have unexplained, persistent fatigue lasting more than six months, along with at least four of the following symptoms: post-exertional malaise; unrefreshing sleep; impaired memory or concentration; muscle pain; multi-joint pain without swelling or redness; tender cervical or axillary lymph nodes; sore throat; or headache. Physical examination is often unremarkable, although tender lymphadenopathy may be present. There are no specific laboratory or imaging findings; testing is performed primarily to exclude alternative causes of fatigue.
The differential diagnosis is broad and includes depression, CMV infection, EBV infection, brucellosis, post-influenza fatigue, Lyme disease, HIV infection, collagen-vascular disorders, malignancies with paraneoplastic syndromes, and brain tumors.
Treatment is supportive and multidisciplinary, aiming for gradual functional improvement rather than immediate resolution of symptoms. Antidepressants may be used when mood disorders coexist. Cognitive behavioral therapy (CBT) has demonstrated benefit in improving coping strategies and functional outcomes. Graded exercise therapy involves carefully structured and progressive increases in physical activity to avoid the “push-crash” cycle of overexertion followed by post-exertional malaise. Activity pacing combines controlled activity scheduling with behavioral strategies. Sleep hygiene and, when indicated, sleep studies may also be helpful.
Complementary therapies such as massage, relaxation techniques, yoga, tai chi, and healing touch may provide symptomatic relief for some patients. Frequent follow-up with a multidisciplinary healthcare team is recommended.
Prognosis varies widely. Time to diagnosis is often prolonged, averaging approximately five years. Symptomatic improvement occurs in 6–63% of patients, while complete resolution is reported in 0–37% of cases.
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