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Related Concept Videos

Encephalitis l: Introduction01:19

Encephalitis l: Introduction

29
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...
29
Arboviral Encephalitis01:25

Arboviral Encephalitis

70
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...
70
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

32
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...
32
Viral Meningitis01:18

Viral Meningitis

219
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...
219
Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

28
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...
28
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

49
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...
49

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Related Experiment Video

Updated: May 6, 2026

Intracerebroventricular and Intravascular Injection of Viral Particles and Fluorescent Microbeads into the Neonatal Brain
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Viral encephalitis.

Marcus Tulius T Silva

    Arquivos De Neuro-Psiquiatria
    |October 22, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Viral encephalitis is a rare but serious brain infection. This review covers common types, focusing on their ecology, diagnosis, and management, especially when the cause is unknown.

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    Area of Science:

    • Neurology
    • Infectious Diseases
    • Virology

    Background:

    • Systemic viral infections are common, but symptomatic viral encephalitis affecting the brain parenchyma is rare.
    • Viral encephalitis affects approximately 1.4 per 100,000 individuals, with geographic location influencing vector-borne pathogen prevalence.
    • Diagnosing viral encephalitis is challenging, as an etiologic agent remains unidentified in nearly 70% of cases.

    Purpose of the Study:

    • To review the most common viral encephalitis etiologies.
    • To discuss the ecological factors influencing viral encephalitis.
    • To outline current diagnostic and clinical management strategies for viral encephalitis.

    Main Methods:

    • Literature review of common viral encephalitis.
    • Analysis of ecological determinants of vector-borne encephalitis.
    • Synthesis of diagnostic approaches and clinical management guidelines.

    Main Results:

    • Common viral encephalitis pathogens and their geographic distribution are detailed.
    • Diagnostic challenges, including a high rate of unidentified etiologies, are highlighted.
    • Effective clinical management strategies are presented.

    Conclusions:

    • Viral encephalitis, though rare, is a significant neurological condition requiring careful diagnosis and management.
    • Understanding viral ecology and diagnostic limitations is crucial for patient care.
    • This review provides a comprehensive overview for clinicians managing viral encephalitis.