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Viral Meningitis

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...

Arboviral Encephalitis

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...

Bacterial Meningitis I: Introduction

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: Pathophysiology

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...

Encephalitis l: Introduction

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: Pathophysiology

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...

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Updated: Jun 30, 2026

Induction and Clinical Scoring of Chronic-Relapsing Experimental Autoimmune Encephalomyelitis

Induction and Clinical Scoring of Chronic-Relapsing Experimental Autoimmune Encephalomyelitis

Published on: July 4, 2007

Diagnosing infectious encephalitis: a narrative review.

Sabine E Olie¹, Steven L Staal¹, Diederik van de Beek¹

¹Department of Neurology, Amsterdam Neuroscience, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, the Netherlands.

Clinical Microbiology and Infection : the Official Publication of the European Society of Clinical Microbiology and Infectious Diseases

|November 24, 2024

Summary

This summary is machine-generated.

Diagnosing infectious encephalitis remains challenging, with current methods confirming the cause in only about half of patients. Novel diagnostic techniques show promise but are not yet ready for widespread clinical use.

Keywords:

CNS infection Cerebrospinal fluid Diagnostics Encephalitis Metagenomics

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Area of Science:

Neurology
Infectious Diseases
Diagnostic Medicine

Background:

Infectious encephalitis diagnosis is complex due to diverse pathogens, primarily viruses.
A significant number of patients lack a pathogen identification despite clinical diagnosis.
Advancements in diagnostic testing aim to improve pathogen detection and address diagnostic challenges.

Purpose of the Study:

To present a comprehensive clinical approach for diagnosing infectious encephalitis.
To explore novel diagnostic methods for identifying causative agents of encephalitis.

Main Methods:

Literature search of PubMed and author-known articles up to September 1, 2024.
Review of clinical characteristics, cerebrospinal fluid (CSF) analysis, and neuroimaging.
Evaluation of emerging techniques like next-generation sequencing and unbiased serology.

Main Results:

Cerebrospinal fluid (CSF) examination is crucial, with leucocyte count being a key indicator.
Microbiological or histopathological tests confirm the cause in approximately 50% of cases.
Neuroimaging and electroencephalography support diagnosis but are primarily adjunctive.

Conclusions:

Microbiological confirmation is essential but achieved in only half of infectious encephalitis cases.
Emerging diagnostic techniques offer potential but face limitations in practicality (complexity, time, cost).
Continued development of advanced diagnostic methods is necessary to improve cause-specific diagnoses.