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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...
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...
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...
Herpes01:28

Herpes

Herpes simplex type 1 (HSV‑1) is a widespread pathogen responsible for orolabial lesions. It is an enveloped, double-stranded DNA (dsDNA) virus belonging to the family Herpesviridae. Once the virus infects a host cell, its double‑stranded DNA genome is delivered into the nucleus, where a coordinated cascade of immediate‑early, early, and late gene expression directs viral DNA replication, structural protein synthesis, and virion assembly. After primary infection of epithelial cells, HSV-1...
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...
Genital Herpes01:23

Genital Herpes

Genital herpes is a sexually transmitted infection primarily caused by herpes simplex virus type 2 (HSV-2), though herpes simplex virus type 1 (HSV-1) is increasingly implicated in genital infections, particularly among younger populations. Transmission occurs mainly through sexual contact, with asymptomatic viral shedding serving as a major route of spread. This characteristic makes HSV-2 difficult to control at a population level, as individuals may unknowingly transmit the virus even in the...

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A Primary Neuron Culture System for the Study of Herpes Simplex Virus Latency and Reactivation
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EPIDEMIC ENCEPHALITIS AND SIMPLE HERPES.

S Flexner1

  • 1Laboratories of The Rockefeller Institute for Medical Research.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

The etiology of epidemic encephalitis remains undetermined. Research indicates that neither herpes simplex virus nor findings from guinea pig experiments definitively identify the cause of epidemic encephalitis.

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Area of Science:

  • Neurology
  • Virology
  • Infectious Diseases

Background:

  • The cause of epidemic encephalitis is a significant public health concern.
  • Distinguishing between known viruses and the hypothetical encephalitis virus is crucial.

Purpose of the Study:

  • To review current knowledge on the etiology of epidemic encephalitis.
  • To differentiate the herpes simplex virus from the suspected encephalitis virus.
  • To analyze the validity of experimental evidence linking viruses to epidemic encephalitis.

Main Methods:

  • Critical review of existing experimental data, including rabbit and guinea pig studies.
  • Analysis of discrepancies in reported findings from different research groups.
  • Consideration of potential confounding factors in etiological studies.

Main Results:

  • Rabbit and guinea pig experiments do not conclusively prove the herpes simplex virus causes epidemic encephalitis.
  • Inconsistent results among researchers suggest potential contamination or latent infections.
  • Lack of harmony in positive findings highlights the challenges in identifying the causative agent.

Conclusions:

  • The identity of the virus causing epidemic encephalitis cannot be established based on current evidence.
  • Discrepancies in research may stem from microbial contamination or latent viral agents.
  • The etiology of epidemic encephalitis is not yet determined, though a single causative agent is probable.