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Related Concept Videos

Viral Meningitis01:18

Viral Meningitis

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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...
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Arboviral Encephalitis01:25

Arboviral Encephalitis

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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...
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Bacterial Meningitis I: Introduction01:22

Bacterial Meningitis I: Introduction

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Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
31
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

45
Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
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Encephalitis l: Introduction01:19

Encephalitis l: Introduction

27
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...
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Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

30
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...
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Intracerebroventricular and Intravascular Injection of Viral Particles and Fluorescent Microbeads into the Neonatal Brain
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Infectious Encephalitis: A Persistent Clinical Challenge.

Armghan Azhar Azhar Munir1, Margaret McCort1, Daniel A Burack1

  • 1Department of Medicine, Montefiore Medical Center/Albert Einstein College of Medicine, 3411 Wayne Avenue, Suite #4H, Bronx, NY 10467, USA.

The Medical Clinics of North America
|April 4, 2025
PubMed
Summary
This summary is machine-generated.

Encephalitis, a severe brain inflammation, often causes lasting neurologic issues. Prompt diagnosis and treatment with intravenous acyclovir are crucial for managing infectious encephalitis in adults.

Keywords:
AcyclovirEncephalitis reviewHSV encephalitisLumbar punctureNext-generation sequencingWest Nile virus

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Area of Science:

  • Neurology
  • Infectious Diseases
  • Virology

Background:

  • Encephalitis is a critical neurological disorder with a high likelihood of long-term complications.
  • Prompt diagnosis and management are essential for improving patient outcomes.
  • Infectious causes are common and require specific diagnostic and therapeutic approaches.

Purpose of the Study:

  • To outline the effective management strategies for adults with suspected infectious encephalitis.
  • To emphasize the importance of early diagnostic testing and empirical treatment.
  • To highlight areas for future research in encephalitis management.

Main Methods:

  • Cerebrospinal fluid (CSF) analysis for common viral pathogens (Herpes Simplex Virus-1, Varicella-Zoster Virus, Enteroviruses, West Nile Virus).
  • Administration of high-dose intravenous acyclovir as an initial therapeutic step.
  • Consideration of epidemiological factors and host immune status for etiological diagnosis.
  • Advanced diagnostic techniques such as next-generation sequencing or brain biopsy when initial tests are inconclusive.

Main Results:

  • Early CSF testing identifies common viral culprits in many encephalitis cases.
  • Intravenous acyclovir is the recommended first-line treatment for suspected herpes simplex virus encephalitis.
  • A significant proportion of encephalitis cases may not have an identified cause despite thorough investigation.
  • Host factors and epidemiological data aid in narrowing down potential etiologies.

Conclusions:

  • Effective management of infectious encephalitis hinges on prompt CSF testing and empirical antiviral therapy.
  • Identifying the specific pathogen is crucial for targeted treatment, though a cause remains elusive in some cases.
  • Further research is needed to develop novel therapeutic strategies for managing this complex neurological syndrome.