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Related Concept Videos

Brain Abscess l: Introduction01:26

Brain Abscess l: Introduction

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A brain abscess is a focal, intracerebral infection characterized by a localized collection of pus within the brain parenchyma, resulting from microbial invasion and the body’s inflammatory response. It progresses through stages: early and late cerebritis, followed by early and late capsule formation, reflecting tissue destruction, immune response, and eventual encapsulation.Etiology and PathogenesisCausative organisms vary with source and host factors, often involving polymicrobial...
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Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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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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Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
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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...
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Related Experiment Video

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Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS
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Massive parallel sequencing provides new perspectives on bacterial brain abscesses.

Øyvind Kommedal1, Marianne Thulin Wilhelmsen2, Steinar Skrede3

  • 1Department of Microbiology, Haukeland University Hospital, Bergen, Norway oyvind.kommedal@helse-bergen.no.

Journal of Clinical Microbiology
|March 28, 2014
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Summary

Massive parallel sequencing (MPS) triples bacterial identification in brain abscesses, revealing key pathogens like Aggregatibacter aphrophilus and Fusobacterium nucleatum. This advanced technique enhances understanding of polymicrobial infections.

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Area of Science:

  • Microbiology
  • Genomics
  • Infectious Diseases

Background:

  • Massive parallel sequencing (MPS) is becoming accessible for diagnostic microbiology.
  • Polymicrobial infections, such as bacterial brain abscesses, require improved diagnostic methods.
  • Current culture- and Sanger sequencing-based diagnostics have limitations in identifying all causative agents.

Purpose of the Study:

  • To explore the potential of MPS for improving the diagnosis and understanding of polymicrobial infections.
  • To use bacterial brain abscesses as a model to evaluate MPS capabilities.
  • To compare MPS results with traditional culture and Sanger sequencing methods.

Main Methods:

  • Prospective nationwide study of 52 bacterial brain abscess samples over 2 years.
  • Categorization of samples into intracerebral, subdural, and postoperative types.
  • Direct amplification and sequencing of bacterial 16S rRNA genes using Ion Torrent MPS (average 500,000 reads/sample).

Main Results:

  • MPS identified triple the number of bacteria compared to culture.
  • Aggregatibacter aphrophilus, Fusobacterium nucleatum, and Streptococcus intermedius were consistently found in spontaneous polymicrobial abscesses.
  • MPS revealed species associations, highlighting F. nucleatum's role in anaerobic flora and increased detection of Actinomyces spp.

Conclusions:

  • MPS offers enhanced accuracy for polymicrobial specimen analysis, provided sufficient reads and contaminant DNA filtering.
  • A. aphrophilus, F. nucleatum, and S. intermedius are suggested as key pathogens in spontaneous brain abscesses.
  • MPS significantly contributes to understanding the development of complex polymicrobial infections.