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Related Concept Videos

Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Colonisation of Pathogens01:25

Colonisation of Pathogens

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...
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,...
Microbial Interactions: Parasitism01:22

Microbial Interactions: Parasitism

Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
Defense Mechanism Against Infection01:26

Defense Mechanism Against Infection

Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
Microbial Interactions: Competition01:26

Microbial Interactions: Competition

Microbial competition is an ecological interaction in which microorganisms vie for limited resources within shared environments. These resources may include nutrients, space, or light, depending on the system. The intensity and outcome of competition are influenced by the environmental context, such as nutrient availability, spatial constraints, and the diversity of microbial species present. These competitive interactions significantly influence the structure, function, and resilience of...

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Related Experiment Video

Updated: May 24, 2026

Investigation of Microbial Cooperation via Imaging Mass Spectrometry Analysis of Bacterial Colonies Grown on Agar and in Tissue During Infection
09:49

Investigation of Microbial Cooperation via Imaging Mass Spectrometry Analysis of Bacterial Colonies Grown on Agar and in Tissue During Infection

Published on: November 18, 2022

Immune discrimination between commensals and pathogenic bacteria.

Hamad H Alanazi1

  • 1Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Jouf University, Al-Qurayyat, Saudi Arabia.

Virulence
|May 22, 2026
PubMed
Summary

The immune system distinguishes between beneficial commensal and harmful pathogenic bacteria. This review explores how the immune system maintains this balance, focusing on mechanisms and therapeutic interventions for microbial restoration.

Keywords:
Microbiotacommensal bacteriagut microbiomehost–microbe interactionsimmune responsepathogenic bacteria

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A Galleria mellonella Oral Administration Model to Study Commensal-Induced Innate Immune Responses
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A Galleria mellonella Oral Administration Model to Study Commensal-Induced Innate Immune Responses

Published on: March 21, 2019

Related Experiment Videos

Last Updated: May 24, 2026

Investigation of Microbial Cooperation via Imaging Mass Spectrometry Analysis of Bacterial Colonies Grown on Agar and in Tissue During Infection
09:49

Investigation of Microbial Cooperation via Imaging Mass Spectrometry Analysis of Bacterial Colonies Grown on Agar and in Tissue During Infection

Published on: November 18, 2022

A Galleria mellonella Oral Administration Model to Study Commensal-Induced Innate Immune Responses
06:32

A Galleria mellonella Oral Administration Model to Study Commensal-Induced Innate Immune Responses

Published on: March 21, 2019

Area of Science:

  • Immunology
  • Microbiology
  • Gastroenterology

Background:

  • Immune system development relies on bacterial interactions.
  • Distinguishing between commensal and pathogenic bacteria is crucial for host defense.
  • Mechanisms for selective immune tolerance toward commensals are not fully understood.

Purpose of the Study:

  • To explore immune system mechanisms for discriminating between commensal and pathogenic bacteria.
  • To address how commensals interact with immune components for protection.
  • To discuss dysbiosis and therapeutic strategies for microbial balance.

Main Methods:

  • Literature review of immune system responses to bacteria.
  • Analysis of host-microbe interactions.
  • Examination of mechanisms for immune discrimination.

Main Results:

  • The immune system employs specific mechanisms to differentiate bacterial types.
  • Commensals engage with immune cells to promote tolerance and protection.
  • Dysbiosis can disrupt microbial balance, necessitating interventions.

Conclusions:

  • Understanding immune discrimination is key to managing host-microbe interactions.
  • Targeting these mechanisms offers potential therapeutic avenues.
  • Restoring microbial balance is vital for immune homeostasis and health.