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Related Concept Videos

Probiotics01:22

Probiotics

296
Probiotics are live, non-pathogenic microorganisms that confer health benefits by modulating the gut microbiota. The human gastrointestinal tract harbors a complex microbial ecosystem, and the balance of this microbiota is crucial for digestive and systemic health. Among the most extensively studied and utilized probiotics are species formerly classified within the genera Lactobacillus and Bifidobacterium. These organisms not only naturally colonize the human gut but are also consumed through...
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Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

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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...
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Microbiota of the Large Intestine01:27

Microbiota of the Large Intestine

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The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
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Bacterial Gastroenteritis01:18

Bacterial Gastroenteritis

88
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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Related Experiment Video

Updated: May 2, 2026

Measuring the Effects of Bacteria and Chemicals on the Intestinal Permeability of Caenorhabditis elegans
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[EHEC carriage in ruminants and probiotic effects].

Evelyne Forano1, Frédérique Chaucheyras-Durand2, Yolande Bertin1

  • 1INRA, UR 454 Microbiologie, Centre de Recherches de Clermont-Ferrand/Theix, 63122 St-Genès-Champanelle, France.

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Summary

Enterohaemorrhagic Escherichia coli (EHEC) persistence in cattle is linked to nutrient utilization. Understanding EHEC metabolism can inform strategies to reduce food contamination and public health risks.

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Area of Science:

  • Microbiology
  • Food Safety
  • Veterinary Science

Context:

  • Enterohaemorrhagic Escherichia coli (EHEC), a type of Shiga-toxin producing E. coli (STEC), poses a significant public health threat, causing severe illnesses like hemolytic-uremic syndrome (HUS).
  • Ruminants, particularly cattle, serve as the primary reservoir for EHEC, leading to foodborne outbreaks through contaminated meat, dairy, water, and produce.
  • While STEC is prevalent in Brazilian ruminants, human EHEC cases are less common, suggesting specific ecological factors influence pathogen transmission.

Purpose:

  • To investigate the mechanisms of EHEC persistence within the ruminant gastrointestinal tract.
  • To identify nutritional and ecological strategies for reducing EHEC survival and subsequent food contamination.
  • To explore the potential of probiotics in mitigating EHEC shedding in livestock.

Summary:

  • EHEC O157:H7 utilizes ethanolamine and mucus-derived sugars as carbon and nitrogen sources, respectively, conferring a competitive growth advantage in the bovine gut.
  • These specific substrates create an ecological niche for EHEC, allowing faster utilization compared to resident intestinal microbiota.
  • Probiotic interventions, including lactic acid bacteria and non-pathogenic E. coli, have demonstrated efficacy in reducing EHEC fecal shedding in vivo and in vitro.

Impact:

  • Elucidating EHEC's metabolic pathways and ecological niche in the bovine gut is crucial for developing targeted interventions.
  • This research paves the way for proposing specific probiotic strains that can outcompete EHEC for essential nutrients.
  • Ultimately, this approach aims to decrease the sanitary risk associated with EHEC contamination in the food supply chain.