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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...
Factors Affecting the Risk of Infection01:26

Factors Affecting the Risk of Infection

The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin create...
Skin Diseases and Disorders01:23

Skin Diseases and Disorders

Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
Autoimmune Disorders01:29

Autoimmune Disorders

Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune system...
Urinary Tract Infection II: Pathophysiology01:25

Urinary Tract Infection II: Pathophysiology

The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
Immunodeficiency Diseases01:25

Immunodeficiency Diseases

Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency disorders...

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Related Experiment Video

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Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
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Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

Published on: February 23, 2014

Persistent bacterial infections and primary immune disorders.

Alexandra F Freeman1, Steven M Holland

  • 1National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-1684, USA.

Current Opinion in Microbiology
|January 9, 2007
PubMed
Summary

Persistent infections by bacteria like Mycobacteria, Salmonella, and Helicobacter are overcome by host immune pathways. Understanding these immune defects, such as the IFN-gamma/IL-12 pathway, reveals bacterial evasion strategies and potential therapies.

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Sequencing of Bacterial Microflora in Peripheral Blood: our Experience with HIV-infected Patients
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Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
11:32

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Published on: February 23, 2014

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

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

Published on: June 11, 2011

Area of Science:

  • Immunology
  • Microbiology
  • Infectious Diseases

Background:

  • Mycobacteria, Salmonella, and Helicobacter species evade host defenses, causing persistent human infections.
  • The IFN-gamma/IL-12 pathway is crucial for controlling Mycobacteria and Salmonella infections.
  • Helicobacter utilizes genetic diversity to evade host immunity, primarily an extracellular bacterium.

Purpose of the Study:

  • To explore host and bacterial mechanisms in persistent infections.
  • To investigate the role of specific immune defects in susceptibility to bacterial pathogens.
  • To identify implications for pathogenesis and therapeutic strategies.

Main Methods:

  • Analysis of immune disorders affecting the IFN-gamma/IL-12 pathway.
  • Examination of X-linked agammaglobulinemia and its association with Helicobacter infections.
  • Comparative study of host-pathogen interactions in Mycobacteria, Salmonella, and Helicobacter.

Main Results:

  • Immune disorders of the IFN-gamma/IL-12 pathway lead to disseminated mycobacterial infections.
  • X-linked agammaglobulinemia patients exhibit susceptibility to chronic Helicobacter infections.
  • Bacterial evasion mechanisms and host immune responses are highlighted through these specific infections.

Conclusions:

  • Specific immune defects reveal critical host defense pathways against bacterial pathogens.
  • Understanding bacterial evasion strategies informs the development of novel therapeutic approaches.
  • The interplay between host immunity and bacterial virulence is key to managing persistent infections.