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Related Concept Videos

Bacterial Gastroenteritis01:18

Bacterial Gastroenteritis

Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
Bacterial Toxins01:12

Bacterial Toxins

Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
Cholera01:25

Cholera

Cholera is an acute gastrointestinal disease caused by the Gram-negative bacterium Vibrio cholerae. It is transmitted primarily via the fecal-oral route through the ingestion of contaminated water or food.Vibrio cholerae is a motile, Gram-negative bacterium of the family Vibrionaceae, primarily associated with waterborne outbreaks in areas with inadequate sanitation. Although over 200 serogroups of V. cholerae exist, only O1 and O139 are responsible for epidemic cholera. The O1 serogroup,...
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...
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

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Related Experiment Video

Updated: Jul 15, 2026

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291
06:51

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

Published on: December 10, 2016

Hypervirulent strains of Clostridium difficile.

Barry Cookson1

  • 1Centre for Infections, Health Protection Agency, 61 Colindale Avenue, London, NW9 5HT, UK. barry.cookson@hpa.org.uk

Postgraduate Medical Journal
|May 10, 2007
PubMed
Summary

Clostridium difficile infections are rising in North America and Europe, with a concerning strain showing antimicrobial resistance. Healthcare practices, including hygiene and staffing, significantly contribute to the spread of this severe diarrheal disease.

Area of Science:

  • Infectious Diseases
  • Epidemiology
  • Microbiology

Background:

  • Increasing incidence of severe Clostridium difficile associated diarrhea (CDAD) in North America and Northern Europe.
  • Emergence of specific strains, such as ribotype O27, with heightened antimicrobial resistance.
  • Recognition of CDAD as a significant public health concern in healthcare and community settings.

Purpose of the Study:

  • To detail the characteristics of emerging Clostridium difficile strains, focusing on ribotype O27.
  • To investigate the factors contributing to the increasing prevalence and severity of CDAD.
  • To highlight the role of healthcare delivery in CDAD transmission and control.

Main Methods:

  • Surveillance system analysis for monitoring CDAD trends.

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A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment
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A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment

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Last Updated: Jul 15, 2026

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291
06:51

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

Published on: December 10, 2016

A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection
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A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection

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A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment
12:58

A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment

Published on: May 25, 2017

  • Detailed characterization of Clostridium difficile strains, including ribotyping and virulence assessment.
  • Review of environmental and treatment-related factors (antimicrobials, cytotoxics, PPIs).

    • Main Results:

    • Ribotype O27 strain exhibits increasing resistance to quinolone antibiotics.
    • Virulence association is complex, influenced by patient case mix.
    • Healthcare environment factors, such as poor hygiene, overcrowding, and staffing issues, are critical contributors.

    Conclusions:

    • Sophisticated typing and virulence assessment systems are needed for emerging strains.
    • Environmental and healthcare delivery factors are crucial in managing CDAD.
    • Improved infection control practices are essential to combat the rising tide of Clostridium difficile infections.