 This study found that 58% of the participants had myalgic encephalomyelitis slash chronic fatigue syndrome, Mi-slash-CFS, which is a chronic illness characterized by extreme fatigue, cognitive impairment, and other symptoms. Additionally, 40% of those without Mi-slash-CFS still met the criteria for the disease. This suggests that Mi-slash-CFS may be more widespread than previously thought, and that it can occur even when people do not identify themselves as having Mi-slash-CFS. This article was authored by Leonard A. Jason and Joseph A. Dory.