An illustration from von Economo's Die Encephalitis lethargica (1918) showing brain tissue of a monkey affected by Encephalitis lethargica, as seen under a microscope
Encephalitis lethargica is an atypical form of encephalitis. Also known as "sleeping sickness" or "sleepy sickness" (distinct from tsetse fly–transmitted sleeping sickness), it was first described in 1917 by neurologist Constantin von Economo[2][3] and pathologist Jean-René Cruchet.[4] The disease attacks the brain, leaving some victims in a statue-like condition, speechless and motionless.[5] Between 1915 and 1926,[6] an epidemic of encephalitis lethargica spread around the world. The exact number of people infected is unknown, but it is estimated that more than one million people contracted the disease during the epidemic, which directly caused more than 500,000 deaths.[7][8][9] Most of those who survived never recovered their pre-morbid vigour.
^von Economo, K. (May 10, 1917). "Die Encephalitis lethargica". Wiener klinische Wochenschrift [Vienna clinical weekly] (in German). 30. Leipzig and Vienna: Franz Deuticke 1918: 581–585.
^Cruchet, R; Moutier, J; Calmettes, A (1917). "Quarante cas d'encéphalomyélite subaiguë" [Forty cases of (subacute) encephalitis lethargica]. Bull Soc Med Hôp (in French). 41. Paris: 614–616.