Benign myalgic encephalomyelitis: an outbreak in a nurses' school in Athens.
DAIKOS, G K, GARZONIS, S, PALEOLOGUE, A et al.·Lancet (London, England)·1959
This 1959 study documented an outbreak of ME/CFS-like illness among nursing students in Athens, Greece. Multiple students developed similar symptoms including muscle pain, fatigue, and neurological problems over a short period. The researchers observed the outbreak and recorded what happened, helping establish that ME/CFS can occur in groups of people.