Related Experiment Video
Updated: Apr 6, 2026

11:22
Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
Published on: October 15, 2019
31.6K
The intestinal microbiome and health
Susan Tuddenham1, Cynthia L Sears
1Division of Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
Current Opinion in Infectious Diseases
|August 4, 2015
Summary
The human intestinal microbiome, crucial for health, is characterized by diversity and resilience. Factors like diet and age influence it, impacting host immunity and metabolism.
Area of Science:
- Microbiology
- Human Physiology
- Immunology
Background:
- The human intestine hosts a diverse microbial community.
- Understanding the intestinal microbiome is key to human health.
Purpose of the Study:
- To define characteristics of a healthy intestinal microbiome.
- To identify factors influencing the healthy intestinal microbiome.
- To explore the microbiome's role in host physiology.
Main Methods:
- Literature review of current research on the intestinal microbiome.
- Analysis of factors affecting the microbiome in healthy individuals.
- Synthesis of evidence on microbiome-host interactions.
Main Results:
- A healthy intestinal microbiome is characterized by diversity, richness, and resilience.
- Age, host immunity, genetics, diet, and antibiotic use modify the microbiome.
- The microbiome plays a critical role in immune system and metabolic function.
Conclusions:
- A complex, bidirectional relationship exists between the intestinal microbiota and host, vital for health.
- Understanding this relationship is crucial for maintaining health and developing new therapies.
- Further research will enhance our understanding of disease and therapeutic strategies.
More Related Videos
Related Concept Videos
Functions of the Gut Microbiota
57
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...
57
Introduction to the Human Microbiota
79
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,...
79
The Oral Microbiota
41
The oral microbiome includes a complex ecosystem comprising over 700 microbial species, identified through genomic sequencing and culture-based analyses to date. This community includes a core microbiome, found universally among individuals, and a variable component influenced by environmental factors such as diet, lifestyle, and host genetics. Site-specific conditions, including oxygen gradients, pH levels, and nutrient availability, determine the spatial distribution of these microorganisms...
41
Microbiota of the Stomach and Small Intestine
49
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,...
49
Microbiota of the Large Intestine
53
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...
53
Development of Human Microbiota
37
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...
37

