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Related Concept Videos

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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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
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Factors Affecting the Risk of Infection01:26

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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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Pathogenesis and Host Immune Response in Leprosy.

Hadida Yasmin1, Praveen Mathews Varghese2,3, Sanjib Bhakta4

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Leprosy, caused by Mycobacterium leprae, involves chronic infection of skin and nerves. Immune responses, particularly T-helper cell activity, dictate disease presentation and severity.

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Area of Science:

  • Immunology
  • Microbiology
  • Genomics

Background:

  • Leprosy is a chronic granulomatous infection caused by Mycobacterium leprae, affecting skin and peripheral nerves.
  • Disease susceptibility and manifestation depend on innate immune responses mediated by monocyte lineage cells.
  • Leprosy presents a spectrum of clinical forms, from tuberculoid to lepromatous, influenced by T-helper cell responses (Th1 vs. Th2).

Purpose of the Study:

  • To explore the cellular morphology and genomic characteristics of Mycobacterium leprae.
  • To understand the pathogen's tropism for host cells, including Schwann cells, macrophages, and dendritic cells.
  • To highlight the challenges in studying M. leprae due to its slow growth and inability to be cultured in vitro.

Main Methods:

  • Review of cellular morphology and genomic data of M. leprae.
  • Discussion of host-pathogen interactions in leprosy.
  • Utilizing the nine-banded armadillo as a model for leprosy research.

Main Results:

  • M. leprae exhibits specific tropism for Schwann cells, macrophages, and dendritic cells.
  • The study details the genomic uniqueness of M. leprae.
  • The nine-banded armadillo serves as a crucial model for studying leprosy.

Conclusions:

  • Understanding M. leprae's cellular and genomic features is key to leprosy research.
  • Host immune responses, particularly T-helper cell polarization, significantly influence leprosy's clinical spectrum.
  • The nine-banded armadillo remains an indispensable model for investigating leprosy pathogenesis and host-pathogen interactions.