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Related Concept Videos

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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Pneumonia II: Pathophysiology

The pathophysiology of pneumonia involves the following steps:
Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
Colonisation of Pathogens01:25

Colonisation of Pathogens

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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Cystic Fibrosis: Pathogenesis

Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
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Defense Against Bacterial Pathogens

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Phagocytes
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Related Experiment Video

Updated: May 24, 2026

Intradermal Inoculation of Mycobacterium avium in the Mouse Ear
09:20

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Published on: July 3, 2025

Mycobacterium avium-triggered diseases: pathogenomics.

Dmitriy Ignatov1, Elena Kondratieva, Tatyana Azhikina

  • 1Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Moscow, Russia.

Cellular Microbiology
|February 22, 2012
PubMed
Summary

Mycobacterium avium comprises diverse subspecies, including human pathogen Mycobacterium avium hominissuis (MAH). This review explores MAH

Area of Science:

  • Microbiology
  • Genomics
  • Pathogenesis

Background:

  • Mycobacterium avium comprises diverse subspecies with varied ecological niches and pathogenicity.
  • Recent genomic data illuminate phylogenetic relationships and niche adaptation within M. avium.
  • Mycobacterium avium hominissuis (MAH) is a significant opportunistic pathogen in immunocompromised individuals.

Purpose of the Study:

  • To review the genetic composition of M. avium subspecies.
  • To discuss the genetic and molecular basis of MAH-triggered disease pathogenesis.
  • To explore virulence, host-pathogen interactions, and host genetic control in MAH infections.

Main Methods:

  • Literature review of genomic and molecular studies on M. avium.
  • Analysis of genetic diversity and phylogenetic relationships.

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  • Examination of virulence factors and host immune responses.
  • Main Results:

    • Genomic diversity explains niche adaptation in M. avium.
    • Specific genetic features contribute to MAH pathogenicity.
    • MAH employs strategies for immune evasion and host cell penetration.

    Conclusions:

    • Understanding M. avium genomics is crucial for deciphering niche adaptation.
    • MAH pathogenesis involves complex genetic and molecular mechanisms.
    • Host genetic factors play a role in susceptibility to MAH infections.