noun[mass noun] British
Encephalitis lethargica, a brain infection causing drowsiness and sometimes coma. See also sleeping sickness.
- Lieberman suggests that he caught encephalitis when in military hospital in 1918, the time of the worldwide ‘sleepy sickness ' epidemic.
- It may result in sleepy sickness and will decrease colostrum/milk production.
- African sleepy sickness is still loose in some parts of Africa.
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