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Related Concept Videos

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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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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Reservoir of Infection01:30

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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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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages
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Exploiting host immunity: the Salmonella paradigm.

Judith Behnsen1, Araceli Perez-Lopez1, Sean-Paul Nuccio2

  • 1Department of Microbiology and Molecular Genetics, University of California, Irvine School of Medicine, Irvine, CA 92697-4025, USA; Institute for Immunology, University of California, Irvine School of Medicine, Irvine, CA 92697-4025, USA.

Trends in Immunology
|January 14, 2015
PubMed
Summary
This summary is machine-generated.

Salmonella bacteria evade host defenses by manipulating immune signals and hiding in macrophages. This allows Salmonella to thrive and outcompete gut microbes during infection.

Keywords:
Salmonellaimmune evasionimmunityinflammationmucosal immunity

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Area of Science:

  • Microbiology
  • Immunology
  • Pathogen-host interactions

Background:

  • Pathogens evolve sophisticated mechanisms to overcome host immune responses.
  • Salmonella enterica utilizes host defense strategies to facilitate its own replication.
  • Understanding these adaptations is crucial for developing effective treatments.

Purpose of the Study:

  • To review recent findings on Salmonella's strategies for establishing systemic and chronic infections.
  • To examine how Salmonella manipulates innate immunity and cell death pathways.
  • To explore Salmonella's immune evasion tactics, including residency in M2 macrophages.

Main Methods:

  • Review of recent scientific literature and research findings.
  • Analysis of molecular and cellular mechanisms employed by Salmonella.
  • Examination of host-pathogen interactions during gastrointestinal infection.

Main Results:

  • Salmonella manipulates innate immune signaling and inflammatory cell death to its advantage.
  • The pathogen establishes chronic and systemic infections by residing in M2 macrophages.
  • Salmonella exploits the oxidative environment and antimicrobial proteins in the gut to outcompete resident microbiota.

Conclusions:

  • Salmonella employs diverse strategies to subvert host immunity for replication and survival.
  • Understanding these mechanisms provides insights into persistent bacterial infections.
  • Targeting Salmonella's immune evasion tactics could lead to novel therapeutic approaches.