alexa Overview: Japanese encephalitis.
Psychiatry

Psychiatry

Journal of Addiction Research & Therapy

Author(s): Misra UK, Kalita J

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Abstract Japanese encephalitis (JE) is one of the most important endemic encephalitis in the world especially in Eastern and Southeastern Asia. JE affects over 50,000 patients and results in 15,000 deaths annually. JE virus is a single stranded positive sense RNA virus belonging to family flaviviridae. JE virus is transmitted through a zoonotic cycle between mosquitoes, pigs and water birds. Humans are accidentally infected and are a dead end host because of low level and transient viremia. In the northern region, large epidemics occur during summers whereas in the southern region JE tends to be endemic: cases occur throughout the year with a peak in the rainy season. Occurrence of JE is more closely related to temperature than to humidity. JE is regarded as a disease of children in the endemic areas but in the newly invaded areas, it affects both the adults and children because of the absence of protective antibodies. For every patient of JE, there are large numbers of subclinical cases (25-1000). Symptomatic JEV infection manifests with nonspecific febrile illness, aseptic meningitis or encephalitis. Encephalitis manifests with altered sensorium, seizures and focal neurological deficit. Acute flaccid paralysis may occur due to anterior horn cell involvement. A wide variety of movement disorders especially transient Parkinsonian features and dystonia (limb, axial, orofacial) are reported in 20-60\% patients. JE mainly affects thalamus, corpus striatum, brainstem and spinal cord as revealed by MRI and on autopsy studies. Coinfection of JE and cysticercosis occurs because of the important role of pigs in the life cycle of both JEV and cysticercosis. Laboratory diagnosis of JE is by IgM capture ELISA, which has high sensitivity and specificity. In the absence of specific antiviral therapy, JE is managed by symptomatic and supportive therapies and preventive measures. Purified formalin inactivated mouse brain derived vaccine and live attenuated vaccine (SA 14-14-2) are available; the latter is reported to be safe, effective and cheap. The role of Chimeric recombinant attenuated JE vaccine is under investigation. Control of JE is related to the wider issues of hygiene, environment, education and economy. (c) 2010 Elsevier Ltd. All rights reserved. This article was published in Prog Neurobiol and referenced in Journal of Addiction Research & Therapy

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