Chronic fatigue. A prospective clinical and virologic study

Area of Science:

• Immunology
• Virology
• Psychiatry

Background:

• Chronic fatigue is a complex condition with potential links to viral infections.
• Epstein-Barr virus (EBV) is a common virus, and its role in chronic fatigue is debated.
• Elevated EBV titers are sometimes observed in patients with chronic fatigue syndrome.

Purpose of the Study:

• To investigate the clinical and virologic course of patients with chronic fatigue and elevated EBV titers.
• To determine if active EBV infection is present in these patients.
• To compare immune responses and psychiatric status with healthy controls.

Main Methods:

• Prospective follow-up of 26 chronic fatigue patients with elevated EBV titers.
• Serial EBV cultures (blood/saliva), serologic tests, and clinical/psychiatric evaluations.
• Comparison with healthy controls, including in vitro natural killer (NK) cell activity and interleukin-2 (IL-2) production.

Main Results:

• No significant difference in EBV isolation or in situ hybridization between patients and controls.
• Similar prevalence and antibody titers for human herpesvirus type 6 (HHV-6) in both groups.
• Patients exhibited higher NK activity and lower IL-2 production; high frequency of DSM-III depressive illness observed.

Conclusions:

• No evidence of ongoing EBV infection was found in patients with chronic fatigue and elevated EBV titers.
• Clinical improvement occurred in over 50% of patients, unrelated to EBV titer changes.
• Chronic fatigue improvement is likely multifactorial, with EBV not appearing to be an active causative agent.