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Related Concept Videos

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...
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...
Rabies01:28

Rabies

Rabies is a lethal zoonotic disease caused by a single-stranded, negative-sense RNA virus of the Lyssavirus genus, within the family Rhabdoviridae. Its primary mode of transmission to humans is through bites or saliva-contaminated scratches from infected mammals such as dogs, bats, raccoons, or foxes. Transmission can also occur if infectious saliva contacts abraded skin or intact mucous membranes, including the conjunctiva.Viral Entry and Early ReplicationOnce introduced at the bite or scratch...
Bacterial Meningitis I: Introduction01:22

Bacterial Meningitis I: Introduction

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...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

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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[Acute infectious encephalitis and pathogens coming from animals].

Jean Paul Stahl1, Alexandra Mailles, Véronique Vaillant

  • 1CHU Michallon, Grenoble Cedex, France. JPStahl@chu-grenoble.fr

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Establishing the cause of acute encephalitis remains challenging, even with advanced diagnostics. French guidelines offer a tiered approach to etiological testing for better patient outcomes and epidemiological understanding.

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Area of Science:

  • Neurology
  • Infectious Diseases
  • Molecular Diagnostics

Context:

  • Acute encephalitis etiological diagnosis is often unestablished in most cases.
  • Incidence, prognosis, and sequelae severity are largely unknown.
  • Current etiological diagnosis rates are below 30% in France.

Purpose:

  • To present French Society for Infectious Diseases recommendations for acute encephalitis etiological diagnosis.
  • To improve individual prognosis, antibiotic management, and epidemiological knowledge.
  • To offer a tiered testing strategy based on French epidemiology.

Summary:

  • Herpetic encephalitis is common in adults; Varicella zoster virus encephalitis in children.
  • Despite diagnostic challenges and lack of specific treatments, etiological exploration is crucial.
  • Recommendations include three levels of etiological tests, from common to rare infections.

Impact:

  • Aims to enhance the etiological diagnosis rate for acute encephalitis.
  • Facilitates precise individual prognosis and optimized patient management.
  • Contributes to improved epidemiological surveillance and understanding of encephalitis.