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Related Concept Videos

Multiple Sclerosis l: Introduction01:19

Multiple Sclerosis l: Introduction

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Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...
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Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

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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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Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

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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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T Cell Types and Functions01:24

T Cell Types and Functions

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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Colonisation of Pathogens01:25

Colonisation of Pathogens

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Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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Myasthenia Gravis ll: Pathophysiology01:22

Myasthenia Gravis ll: Pathophysiology

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The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...
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Related Experiment Video

Updated: May 5, 2026

An Ex vivo Model of an Oligodendrocyte-directed T-Cell Attack in Acute Brain Slices
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Role of pathogens in multiple sclerosis.

Jane E Libbey1, Matthew F Cusick, Robert S Fujinami

  • 1Department of Pathology, University of Utah School of Medicine , Salt Lake City, UT , USAxs.

International Reviews of Immunology
|November 26, 2013
PubMed
Summary

Infectious agents like bacteria and viruses may trigger multiple sclerosis (MS), an autoimmune CNS disease. However, parasitic infections might offer protection, suggesting a complex interplay in MS etiology.

Keywords:
bacteriaparasitesprotozoasuperantigensviruses

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Last Updated: May 5, 2026

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Area of Science:

  • Neuroimmunology
  • Infectious Disease Immunology

Background:

  • Multiple sclerosis (MS) is a central nervous system (CNS) autoimmune disease characterized by inflammation and demyelination.
  • The exact cause of MS remains unknown, but genetic and environmental factors, particularly infectious agents, are implicated.

Purpose of the Study:

  • To review evidence linking various infectious pathogens to MS development or exacerbation.
  • To explore the protective role of helminthic (parasitic worm) infections in MS.
  • To discuss potential mechanisms and future research directions for understanding MS etiology.

Main Methods:

  • Review of human and animal studies on pathogen associations with MS.
  • Analysis of proposed immunological mechanisms (molecular mimicry, epitope spreading, bystander activation).
  • Discussion of evidence for parasitic protection and a Phase I clinical trial of Trichuris suis ova therapy.

Main Results:

  • Certain bacteria (Mycoplasma pneumoniae, Chlamydia pneumoniae), viruses (Epstein-Barr virus, HHV-6, HERVs), and protozoa (Acanthamoeba castellanii) are associated with MS.
  • Helminth infections appear to have a protective effect against MS development or exacerbation.
  • A Trichuris suis ova Phase I trial showed potential for improving MS clinical course.

Conclusions:

  • The etiology of MS likely involves a complex interaction between the CNS, the immune system, and multiple infectious agents.
  • Understanding these interactions is crucial for deciphering the causes of MS.
  • Targeting specific infections or leveraging protective mechanisms may offer therapeutic strategies for MS.