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Related Concept Videos

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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Introduction to the Human Microbiota01:22

Introduction to the Human Microbiota

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Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity,...
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Microbiota of the Stomach and Small Intestine01:27

Microbiota of the Stomach and Small Intestine

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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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Development of Human Microbiota01:30

Development of Human Microbiota

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The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from...
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Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

145
The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
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Bacterial Flora of the Large Intestine01:29

Bacterial Flora of the Large Intestine

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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.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
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Related Experiment Video

Updated: Apr 26, 2026

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

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Clostridium difficile and the microbiota.

Anna M Seekatz, Vincent B Young

    The Journal of Clinical Investigation
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    PubMed
    Summary
    This summary is machine-generated.

    Clostridium difficile infection (CDI) is a major healthcare concern. Understanding how gut microbes restore colonization resistance after antibiotic disruption is key to developing new treatments for recurrent CDI.

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    Area of Science:

    • Microbiology
    • Gastroenterology
    • Infectious Diseases

    Background:

    • Clostridium difficile infection (CDI) is a significant healthcare-associated illness.
    • The gut microbiota provides colonization resistance against C. difficile.
    • Antibiotic use disrupts the gut microbiota, increasing CDI risk.

    Purpose of the Study:

    • To identify specific microbes that can restore colonization resistance against C. difficile.
    • To understand the role of microbial communities in the metabolic environment of the gut.
    • To improve biotherapeutic strategies for CDI, especially recurrent cases.

    Main Methods:

    • Review of human and animal models demonstrating the importance of gut microbiota in colonization resistance.
    • Analysis of risk factors for CDI, including antibiotic-induced dysbiosis.
    • Exploration of future research directions focusing on microbial community influence on the metabolic environment.

    Main Results:

    • The gut microbiota plays a crucial role in preventing C. difficile colonization.
    • Antibiotic treatment disrupts this protective microbial community.
    • Specific microbes capable of restoring colonization resistance are yet to be definitively identified.

    Conclusions:

    • Further research into microbial communities and their metabolic impact is needed to understand CDI pathogenesis.
    • Identifying key microbes is essential for developing effective biotherapeutics for CDI.
    • Improved understanding will aid in treating recurrent CDI and restoring gut health.