What are the clinical manifestations of Japanese encephalitis?

Japanese encephalitis (JE) is an infectious disease; however, some individuals infected with JE may overlook its symptoms. So, what are the clinical manifestations of Japanese encephalitis?

What Are the Clinical Manifestations of Japanese Encephalitis?

The hallmark symptoms of Japanese encephalitis include sudden onset of high fever and disturbances in consciousness. As the disease progresses, these neurological impairments worsen. In severe cases, patients may experience seizures—including generalized convulsions and limb twitching. Inflammation of the brain parenchyma can lead to central respiratory failure, characterized by irregular and abnormal breathing patterns. Critically ill patients may develop respiratory failure, apnea, and dysfunction in speech-related cortical areas.

Japanese encephalitis typically requires targeted treatment. If seizures occur, sedatives may be administered under a physician’s guidance. For fevers exceeding 38.5°C, physical cooling methods are recommended as adjunctive therapy; antipyretics may be prescribed when necessary. Prompt intervention is essential if complications such as hemiplegia or persistent consciousness impairment arise. Most cases of JE are caused by infection with the Japanese encephalitis virus, with an incubation period averaging approximately 10–15 days.

Most children develop mild fever following JE vaccination. This fever is usually transient and can be managed effectively with physical cooling measures. Vaccination is not recommended for individuals with congenital immunodeficiency, pre-existing otitis media, or known hypersensitivity. After JE vaccination, proper care of the injection site is crucial to prevent infection or local inflammation. We hope this information has been helpful!