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Related Concept Videos

Microbiota of the Large Intestine01:27

Microbiota of the Large Intestine

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...
Anatomy of the Intestines01:23

Anatomy of the Intestines

Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the small...
Microbiota of the Stomach and Small Intestine01:27

Microbiota of the Stomach and Small Intestine

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,...
Bacterial Flora of the Large Intestine01:29

Bacterial Flora of the Large Intestine

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.
Dysbiosis of the Gut Microbiota01:18

Dysbiosis of the Gut Microbiota

The human gut microbiome includes a diverse array of microbial species, including beneficial commensals and opportunistic pathogens, which interact to support host health. These microbes contribute to essential functions such as nutrient metabolism, immune system modulation, and maintenance of intestinal barrier integrity. However, disruptions to this equilibrium—referred to as dysbiosis—can have widespread physiological consequences.Dysbiosis is often characterized by reduced microbial...
Inflammatory Bowel Disease III: Crohn's Disease01:25

Inflammatory Bowel Disease III: Crohn's Disease

Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...

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Related Experiment Video

Updated: Jun 15, 2026

Ileectomy-induced Bile Overaccumulation in Mouse Intestine
06:55

Ileectomy-induced Bile Overaccumulation in Mouse Intestine

Published on: August 21, 2017

[Small intestine bacterial overgrowth].

E L Leung Ki1, J Roduit, J Delarive

  • 1Service de Gastro-Entérologie et D'Hepatologie, CHUV. en-ling.leung-ki@chuv.ch

Revue Medicale Suisse
|March 11, 2010
PubMed
Summary

Small intestine bacterial overgrowth (SIBO) involves nutrient malabsorption due to excessive gut bacteria. Diagnosis requires differentiating it from other conditions, with treatment focusing on predisposing factors and antibiotics.

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Area of Science:

  • Gastroenterology
  • Microbiology
  • Internal Medicine

Context:

  • Small intestine bacterial overgrowth (SIBO) is a complex condition with diverse symptoms.
  • It can be mistaken for other gastrointestinal disorders like celiac disease or IBS.
  • Predisposing factors include anatomical abnormalities and functional issues like hypomotility.

Purpose:

  • To outline the characteristics, diagnostic challenges, and management of SIBO.
  • To emphasize the importance of identifying underlying causes.
  • To highlight the role of the hydrogen breath test and antibiotic therapy.

Summary:

  • SIBO presents with malabsorption, diarrhea, and flatulence, but can be asymptomatic in the elderly.
  • Accurate diagnosis necessitates distinguishing SIBO from conditions with similar symptoms.
  • Treatment involves addressing predisposing factors and administering broad-spectrum antibiotics.

Impact:

  • Improved diagnostic accuracy for SIBO.
  • Enhanced understanding of SIBO's multifactorial nature.
  • Guidance for clinical management and therapeutic strategies.