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Related Concept Videos

Encephalitis l: Introduction01:19

Encephalitis l: Introduction

Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
Arboviral Encephalitis01:25

Arboviral Encephalitis

Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
Viral Meningitis01:18

Viral Meningitis

Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...
Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion of food...
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...

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Related Experiment Video

Updated: May 11, 2026

A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease
04:23

A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease

Published on: April 28, 2019

Acute viral encephalitis.

F Rozenberg1

  • 1Université Paris Descartes & Department of Virology, Hôpital Cochin, France.

Handbook of Clinical Neurology
|April 30, 2013
PubMed
Summary
This summary is machine-generated.

Acute viral encephalitis, particularly Herpes Simplex Encephalitis (HSE), is a severe brain infection. Early antiviral therapy improves outcomes, but sequelae and relapses persist due to viral latency and immune responses.

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Area of Science:

  • Neurology
  • Virology
  • Immunology

Background:

  • Acute viral encephalitis is a rare but severe complication of viral infections.
  • Primary encephalitis involves direct viral invasion, while postinfectious forms are immune-mediated.
  • Herpes simplex virus (HSV) is the most common cause of encephalitis in Western countries, particularly affecting infants.

Purpose of the Study:

  • To review the pathogenesis, diagnosis, and treatment of Herpes Simplex Encephalitis (HSE).
  • To highlight the challenges in managing HSE, including diagnosis, latency, and immune-mediated damage.
  • To discuss the potential for immunomodulatory treatments.

Main Methods:

  • Literature review of primary viral encephalitis and Herpes Simplex Encephalitis.
  • Analysis of pathogenesis, including viral invasion and immune responses.
  • Evaluation of diagnostic methods and therapeutic interventions for HSE.

Main Results:

  • Herpes simplex virus (HSV) is the leading cause of encephalitis in Western nations, with a peak incidence in the first year of life.
  • Early antiviral therapy significantly improves HSE prognosis, yet high rates of sequelae and relapses persist.
  • Viral latency and host inflammatory responses are implicated in treatment failure and disease recurrence.

Conclusions:

  • Despite advances, HSE management remains challenging due to diagnostic difficulties, viral latency, and complex immune responses.
  • Early diagnosis and prompt antiviral treatment are crucial for improving patient outcomes.
  • Further research into immunomodulatory strategies is needed to address treatment failures and reduce long-term sequelae.