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DAILY NEWS ANALYSIS
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28 October, 2025
4 Min Read
Recent research has highlighted a concerning connection between waning immunity against Japanese encephalitis virus (JEV) and an increased risk of more severe dengue infections.
Japanese Encephalitis (JE) is a viral zoonotic disease, meaning it is transmitted from animals to humans. The disease is caused by the Japanese Encephalitis virus (JEV), a flavivirus. JEV is in the same virus family as dengue, yellow fever, and West Nile virus.
Mosquito-borne: The primary vector for JEV is the Culex mosquito, specifically from the Vishnui group. These mosquitoes are typically found in rural regions of Asia, especially during the monsoon season when mosquito breeding conditions are optimal.
No Human-to-Human Transmission: JEV is not transmitted from person to person. Humans are infected when bitten by an infected mosquito.
Mild cases: Many infected individuals may have no symptoms or only mild ones.
Severe cases: In more severe instances, JE affects the brain, causing:
Fever
Headache
Vomiting
Neurological symptoms such as:
Confusion
Seizures
Paralysis
Severe JE can lead to permanent brain damage or even death.
Prevention:
Vaccination: The most effective way to prevent JE, especially in endemic regions. The vaccine has been included in India's Universal Immunization Programme since 2013, typically requiring two doses for full protection.
Mosquito Control: In areas with high transmission, efforts are made to control mosquito populations, such as through insecticides and draining of mosquito breeding sites.
Treatment:
No Specific Antiviral Treatment: There is no direct antiviral treatment for JE.
Supportive Care: Patients with JE receive supportive treatment aimed at stabilizing their condition and relieving symptoms, such as anti-seizure medications and fluid management.
Interaction with Dengue: The study suggests that waning immunity against JE could increase susceptibility to severe forms of dengue, a related mosquito-borne disease. This interaction underscores the complex relationships between different viral infections that can complicate diagnosis and treatment.
Endemic Areas: JE is most prevalent in rural areas of Asia, particularly in India, China, Nepal, Indonesia, and parts of Southeast Asia. It often occurs in areas where mosquito breeding is rampant during the monsoon season.
Source: INDIAN EXPRESS
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