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Related Concept Videos

Reservoir of Infection01:30

Reservoir of Infection

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Infectious diseases arise from intricate interactions between pathogens and their reservoirs. A reservoir of infection refers to the natural habitat where a pathogen lives, grows, and multiplies, serving as a continual source of infection. Reservoirs are broadly classified as either living or nonliving, and each plays a unique role in disease transmission, significantly influencing public health interventions and control strategies.Humans act as reservoirs for a wide array of pathogens,...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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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...
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Colonisation of Pathogens01:25

Colonisation of Pathogens

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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...
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Factors Affecting the Risk of Infection01:26

Factors Affecting the Risk of Infection

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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...
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Defense Mechanism Against Infection01:26

Defense Mechanism Against Infection

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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...
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Immunological Memory01:23

Immunological Memory

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
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Updated: Apr 28, 2026

Chronic Salmonella Infection Induced Intestinal Fibrosis
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Immunity to intestinal pathogens: lessons learned from Salmonella.

Stephen J McSorley1

  • 1Center for Comparative Medicine, Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California Davis, Davis, CA, USA.

Immunological Reviews
|June 20, 2014
PubMed
Summary

Salmonella infections are common, and animal models reveal complex immune responses. Understanding these dynamics offers insights into protective immunity against intestinal pathogens.

Keywords:
CD4+ T cellsbacterial immunityimmune evasionlymphocyte trackingnon-cognate activation

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Area of Science:

  • Immunology
  • Microbiology
  • Infectious Diseases

Background:

  • Salmonella is a frequent cause of food- and water-borne illnesses in humans and animals.
  • Salmonella infection models in animals elicit strong immune responses, aiding immunological research.
  • These models are crucial for studying host immunity to intestinal pathogens.

Purpose of the Study:

  • To review current knowledge on innate and adaptive immunity against Salmonella.
  • To highlight recent findings on immune responses to Salmonella infection.
  • To explore the complexities of host-pathogen interactions in mucosal immunity.

Main Methods:

  • Review of current scientific literature on Salmonella immunity.
  • Analysis of immunological studies utilizing Salmonella infection models.
  • Synthesis of data on T-cell responses, microbial evasion, and effector functions.

Main Results:

  • Salmonella infection elicits heterogeneous antigen-specific T-cell responses.
  • Microbial strategies effectively hinder T- and B-cell mediated immunity.
  • Non-cognate pathways significantly contribute to T-cell effector functions.

Conclusions:

  • Host-pathogen interactions during mucosal infections are more complex than previously thought.
  • Recent studies challenge simplistic views of Salmonella-host immune dynamics.
  • Understanding these complexities provides deeper insights into protective immunity.