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Related Concept Videos

Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
Brain Abscess l: Introduction01:26

Brain Abscess l: Introduction

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 infections,...
Stages of Infection01:26

Stages of Infection

Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
Determinants of Bacterial Pathogenicity and Virulence01:20

Determinants of Bacterial Pathogenicity and Virulence

Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
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Bacterial Phylum Actinobacteria

Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...

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Development and Assessment of Intracellular Infection Models for Staphylococcus aureus
08:32

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus

Published on: January 17, 2025

A play in four acts: Staphylococcus aureus abscess formation.

Alice G Cheng1, Andrea C DeDent, Olaf Schneewind

  • 1Department of Microbiology, University of Chicago, Chicago, Illinois 60637, USA.

Trends in Microbiology
|March 1, 2011
PubMed
Summary

Staphylococcus aureus actively forms abscesses using specific virulence factors, not just as a healing response. Targeting these factors, like Protein A, can prevent staphylococcal abscesses.

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Area of Science:

  • Microbiology
  • Immunology
  • Pathogenesis

Background:

  • Staphylococcus aureus is a significant human pathogen causing skin and soft tissue abscesses.
  • Abscess formation is traditionally viewed as a feature of healing and tissue repair.

Purpose of the Study:

  • To challenge the traditional view of abscess formation.
  • To investigate Staphylococcus aureus's specific virulence factors in promoting distinct abscess lesions.
  • To identify key stages and genetic requirements for abscess development.

Main Methods:

  • Investigated the role of live Staphylococcus aureus in abscess formation.
  • Identified specific genes and virulence factors essential for abscess development.
  • Evaluated humoral immune responses against key virulence factors in animal models.

Main Results:

  • Staphylococcus aureus actively promotes abscess formation through distinct virulence factors.
  • Abscess development requires genes acting at four discrete stages.
  • Protein A and coagulases are identified as key virulence attributes.
  • Immune responses targeting these factors protected against abscesses in animal models.

Conclusions:

  • Staphylococcus aureus actively manipulates host responses to create unique abscesses.
  • Specific virulence factors, including Protein A and coagulases, are crucial for abscess development.
  • Targeting these virulence factors offers a potential strategy for preventing staphylococcal infections.