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Related Concept Videos

Bacterial Gastroenteritis01:18

Bacterial Gastroenteritis

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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...
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Bacterial Toxins01:12

Bacterial Toxins

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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...
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Stringent Response in E. coli01:23

Stringent Response in E. coli

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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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Cholera01:25

Cholera

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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,...
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Reservoir of Infection01:30

Reservoir of Infection

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Infectious diseases arise from intricate interactions between pathogens and their reservoirs. A reservoir of infection refers to the natural habitat where a pathogen lives, grows, and multiplies, serving as a continual source of infection. Reservoirs are broadly classified as either living or nonliving, and each plays a unique role in disease transmission, significantly influencing public health interventions and control strategies.Humans act as reservoirs for a wide array of pathogens,...
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Investigation of Disease Outbreaks

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Multistate foodborne outbreaks pose significant public health risks and require meticulous investigation to identify sources and implement control measures. The Centers for Disease Control and Prevention (CDC) utilizes a dynamic seven-step process for these investigations, integrating data from laboratories, interviews, and environmental assessments to protect public health.Outbreak Detection: The detection of multistate outbreaks typically begins with PulseNet, the CDC's national laboratory...
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Related Experiment Video

Updated: May 4, 2026

Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing
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Shiga toxin-producing Escherichia coli.

James L Smith1, Pina M Fratamico1, Nereus W Gunther1

  • 1USDA, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, Pennsylvania, USA.

Advances in Applied Microbiology
|January 1, 2014
PubMed
Summary

Non-O157 Shiga toxin-producing Escherichia coli (STEC) cause more illnesses than O157:H7 in the US. Further research into non-O157 STEC is crucial for developing effective control strategies against these foodborne pathogens.

Keywords:
Comparative genomicsDetectionE. coliEcologyEpidemiologyFoodFood-borne pathogenQuorum sensingSTECShiga toxinStress responsesVirulence

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Area of Science:

  • Food Safety
  • Microbiology
  • Public Health

Background:

  • Non-O157 Shiga toxin-producing Escherichia coli (STEC) are responsible for a significant portion of STEC-related illnesses in the United States, often exceeding those caused by STEC O157:H7.
  • The 'top six' non-O157 STEC serogroups (O26, O45, O103, O111, O121, and O145) can cause severe diseases, including hemorrhagic colitis and hemolytic uremic syndrome, despite generally milder symptoms compared to O157 STEC.
  • Cattle serve as reservoirs for both O157 and non-O157 STEC, with transmission to humans occurring through contaminated food, water, or direct contact.

Purpose of the Study:

  • To highlight the public health significance of non-O157 STEC infections.
  • To underscore the need for improved strategies to control STEC in food production.
  • To emphasize the necessity of further research into the characteristics of non-O157 STEC to enhance detection and control.

Main Methods:

  • Literature review and synthesis of existing data on non-O157 STEC epidemiology and characteristics.
  • Comparison of non-O157 STEC with O157 STEC regarding pathogenicity and stress responses.
  • Analysis of regulatory status and challenges in pathogen detection.

Main Results:

  • Non-O157 STEC cause more illnesses than STEC O157:H7, with specific serogroups posing significant public health risks.
  • Non-O157 STEC exhibit similar stress responses to food preparation conditions as O157 STEC.
  • The genetic and phenotypic diversity of non-O157 STEC presents challenges for accurate detection and isolation.

Conclusions:

  • Effective control strategies for STEC colonization, shedding in cattle, and contamination of meat and produce are urgently needed.
  • The USDA Food Safety and Inspection Service classifies the top six non-O157 STEC as adulterants in beef, necessitating regulatory testing.
  • Extensive research into the physiology, genetics, pathogenicity, and evolution of non-O157 STEC is essential for developing robust control measures.