encephalitis lethargica
C2technical/medical
Definition
Meaning
A rare, severe form of encephalitis characterized by high fever, headache, double vision, delayed physical and mental response, and extreme lethargy.
An epidemic disease of the early 20th century, often called 'sleeping sickness', which could lead to post-encephalitic parkinsonism.
Linguistics
Semantic Notes
Primarily a historical medical term; used almost exclusively in neurology and medical history contexts.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage or spelling.
Connotations
Associated with the 1915–1926 epidemic; sometimes referenced in discussions of neurological sequelae.
Frequency
Extremely rare in general discourse, used with equal rarity in both UK and US medical contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
Patient + was diagnosed with encephalitis lethargica.The epidemic of encephalitis lethargica + occurred in the 1920s.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Awakenings (in reference to Oliver Sacks's work on post-encephalitic patients)”
Usage
Context Usage
Business
Not used.
Academic
Used in medical history, neurology, and epidemiology papers.
Everyday
Almost never used.
Technical
Used in neurology, infectious disease, and medical history contexts.
Examples
By Part of Speech
adjective
British English
- The patient exhibited encephalitis lethargica symptoms.
American English
- She researched encephalitis lethargica cases.
Examples
By CEFR Level
- Encephalitis lethargica made many people very sleepy.
- The historical outbreak of encephalitis lethargica affected thousands in the early 20th century.
- Oliver Sacks's book 'Awakenings' detailed the lives of patients with post-encephalitic parkinsonism following encephalitis lethargica.
Learning
Memory Aids
Mnemonic
Think: 'Encephalitis' (brain inflammation) + 'lethargica' (lethargic). It's the 'sleeping sickness' that affected the brain.
Conceptual Metaphor
The sleeping sickness; a thief of consciousness.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'летаргический энцефалит' — it's the same term.
- Do not translate 'lethargica' as just 'вялый'; it is part of the fixed medical term.
Common Mistakes
- Misspelling 'lethargica' as 'lethargic'.
- Using it as a general term for any tiredness or brain fog.
Practice
Quiz
Encephalitis lethargica is most closely associated with which neurological condition?
FAQ
Frequently Asked Questions
No, it was primarily an epidemic disease of the early 20th century and is now extremely rare.
It is often called 'sleeping sickness', though this term is also used for the tropical disease trypanosomiasis.
Neurologist Oliver Sacks's book 'Awakenings', later adapted into a film, which described patients who had survived the epidemic.
Many survivors developed post-encephalitic parkinsonism, a severe form of Parkinson's disease, years or decades later.