http://www.chronicfatiguesupport.com/library/print.cfm?ID=4181

Immunotherapy of Chronic Fatigue Syndrome: Therapeutic Interventions Aimed at Modulating the Th1/Th2 Cytokine Expression Balance

http://www.chronicfatiguesupport.com/library/print.cfm?ID=3848

Reactivation of latent herpes viruses (notably Epstein-Barr virus, human herpesvirus-6) is commonly seen in chronic fatigue syndrome and it is believed to contribute to symptom perpetuation.

http://www.users.on.net/~julian.robinson/
cfs/rpm-klimas-paper.htm

Immunotherapy of Chronic Fatigue Syndrome: Therapeutic Interventions Aimed at Modulating the Th1/Th2 Cytokine Expression Balance