Chronic Fatigue Syndrome does not appear to be a new illness. Relatively small outbreaks of similar disorders have been described in the medical literature since the 1930s. Furthermore, case reports of comparable illnesses date back several centuries, some possibly linked to bacterial, viral, or protozoal infections such as brucellosis, yellow fever, hepatitis, influenza, and malaria.
http://www.immunesupport.com/chronic-fatigue-syndrome-history.htm