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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 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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Microbiota of the Stomach and Small Intestine01:27

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The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...
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Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
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The human urogenital system, once thought to be sterile in healthy individuals, is now recognized as a complex microbial habitat. Advancements in molecular sequencing techniques have revealed that even in healthy adults, the kidneys and bladder harbor microbial populations similar to those found in the distal urethra, albeit in much lower abundance. These resident microorganisms, while generally innocuous, can become opportunistic pathogens under conditions that alter the urogenital...
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Gastrointestinal Tract Colonization Dynamics by Different Enterococcus faecium Clades.

Maria Camila Montealegre1, Kavindra V Singh2, Barbara E Murray1

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Clade B Enterococcus faecium, common in healthy individuals, outcompetes infection-associated Clade A strains in the gut. This explains Clade B

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Enterococcus faeciumGITcladescolonizationfitness

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Area of Science:

  • Microbiology
  • Gastroenterology
  • Infectious Diseases

Background:

  • Antibiotic-resistant Enterococcus faecium infections often follow gastrointestinal tract colonization.
  • Enterococcus faecium exists in distinct lineages, including Clade B (healthy microbiota), Clade A1 (infections), and Clade A2 (animal-associated).

Purpose of the Study:

  • To compare the colonization capabilities of different Enterococcus faecium lineages within a mouse gastrointestinal tract model.
  • To investigate the competitive dynamics between E. faecium clades in vivo.

Main Methods:

  • Utilized a mouse model to assess gastrointestinal tract colonization by E. faecium strains from Clade B, Subclade A1, and Subclade A2.
  • Performed mono-inoculation and competition assays to quantify colonization levels (CFU/g).

Main Results:

  • No significant difference in colonization was observed between clades after mono-inoculation.
  • Clade B strains significantly outcompeted Clade A strains in persistence within the gastrointestinal tract during competition assays.
  • Competitive advantage of Clade B was evident by day 2 and significant for all pairs by day 14.

Conclusions:

  • Clade B strains possess a competitive advantage for gastrointestinal tract colonization over Clade A strains.
  • This competitive superiority may explain the prevalence of Clade B in the general community and its ability to displace hospital-associated E. faecium strains.