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Published on: December 29, 2015
[Flavivirus Infection (Japanese Encephalitis)]
1Department of Neurology, Yamaguchi Prefectural Grand Medical Center.
Brain and Nerve = Shinkei Kenkyu No Shinpo
|May 19, 2026
Summary
Japanese encephalitis is a serious neuroinfectious disease in Japan, particularly affecting older adults. Early diagnosis and recognition of clinical features are crucial for effective management and treatment.
Area of Science:
- Neuroscience
- Infectious Diseases
- Epidemiology
Background:
- Japanese encephalitis is a significant neuroinfectious disease in Japan.
- Middle-aged and older adults are at increased risk due to lower antibody prevalence.
- The summer-to-autumn season presents a higher risk for acute encephalitis.
Purpose of the Study:
- To summarize key clinical aspects of Japanese encephalitis.
- To guide clinicians in diagnosing acute encephalitis, especially during peak seasons.
- To provide insights into the diagnostic approach for flavivirus encephalitides.
Main Methods:
- Review of clinical features and diagnostic criteria for Japanese encephalitis.
- Analysis of risk factors, including age and antibody prevalence.
- Correlation of clinical signs with neuroanatomical involvement.
Main Results:
- Characteristic symptoms include high fever, impaired consciousness, and extrapyramidal signs.
- Frequent involvement of the thalamus and substantia nigra is observed.
- Diagnosis relies on serologic testing of acute and convalescent specimens.
Conclusions:
- Clinicians should consider Japanese encephalitis in cases of acute encephalitis during summer and autumn.
- Understanding characteristic clinical features aids in early diagnosis.
- This summary also informs the diagnosis of other flavivirus encephalitides.
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