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Related Concept Videos

Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

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...
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,...
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...
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.
Introduction to the Human Microbiota01:22

Introduction to the Human Microbiota

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, and disease...
Sexually Transmitted Infections01:26

Sexually Transmitted Infections

Sexually transmitted infections (STIs) are diseases transmitted primarily through unsafe sexual interactions. Bacteria, viruses, or parasites cause them and can result in severe health complications if untreated.ChlamydiaThe bacterium Chlamydia trachomatis is responsible for the disease Chlamydia, the most common STI in the United States. This peculiar pathogen requires human cells to reproduce, residing intracellularly. The initial infection often goes unnoticed because it typically does not...

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Updated: May 13, 2026

Sequencing of Bacterial Microflora in Peripheral Blood: our Experience with HIV-infected Patients
13:50

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Published on: June 11, 2011

How intestinal bacteria can promote HIV replication.

Zhanjun Shu1, Jianping Ma, Dilinuer Tuerhong

  • 1Division of AIDS Research, National Traditional Chinese Medicine Clinical Research Bases in Xinjiang, Urumuqi, China.

AIDS Reviews
|March 2, 2013
PubMed
Summary

Gut bacteria, or microbiota, may play a role in HIV infection. This review explores how gut microbes might influence the progression and transmission of HIV, impacting the immune system.

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Area of Science:

  • Microbiology
  • Immunology
  • Virology

Background:

  • The human body hosts a vast community of bacteria known as microbiota, which are increasingly recognized for their role in health and disease.
  • While the protective functions of commensal bacteria against pathogens are established, their specific influence on human immunodeficiency virus (HIV) remains largely unexplored.

Purpose of the Study:

  • This review aims to elucidate the role of gut microbiota in the pathogenesis of retroviral infections, particularly HIV.
  • To explore the intricate relationship between the gut microbiome and the immune system in the context of HIV.

Main Methods:

  • A comprehensive review of existing scientific literature on gut microbiota, retroviral pathogenesis, and HIV.
  • Analysis of mechanisms by which gut bacteria and their byproducts interact with the host immune system.

Main Results:

  • HIV infection disrupts the delicate balance of the gut microbiota and the gastrointestinal tract.
  • Bacterial components like lipopolysaccharide translocate into circulation, activating toll-like receptors (TLR) and the innate immune system.
  • TLR-4 activation leads to the production of interleukin-10, promoting immunological tolerance.

Conclusions:

  • Intestinal microbes may be implicated in the triggering of HIV replication and transmission.
  • The gut microbiome represents a potential factor in the complex interplay of factors driving retroviral pathogenesis.
  • Understanding the gut microbiota's role could offer new insights into managing HIV infection.