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Related Concept Videos

Primary Lymphoid Organs01:16

Primary Lymphoid Organs

Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
Development of Immunocompetence01:22

Development of Immunocompetence

The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
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...
Infectious Diseases and Their Occurrence01:28

Infectious Diseases and Their Occurrence

Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable temporal or...

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Related Experiment Video

Updated: May 8, 2026

Peptide-based Identification of Functional Motifs and their Binding Partners
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Peptide-based Identification of Functional Motifs and their Binding Partners

Published on: July 1, 2013

Primary immunodeficiency diseases: an update.

Luigi Notarangelo1, Jean-Laurent Casanova, Alain Fischer

  • 1Department of Pediatrics, University of Brescia Spedali Civili, Brescia, Italy.

The Journal of Allergy and Clinical Immunology
|September 10, 2004
PubMed
Summary
This summary is machine-generated.

Primary immune deficiency diseases (PIDs) offer insights into immune system function. Recent advancements have elucidated the molecular basis of over 100 PIDs, leading to updated classifications.

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Simultaneous Quantification of T-Cell Receptor Excision Circles (TRECs) and K-Deleting Recombination Excision Circles (KRECs) by Real-time PCR

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Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay
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Last Updated: May 8, 2026

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Simultaneous Quantification of T-Cell Receptor Excision Circles (TRECs) and K-Deleting Recombination Excision Circles (KRECs) by Real-time PCR
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Simultaneous Quantification of T-Cell Receptor Excision Circles (TRECs) and K-Deleting Recombination Excision Circles (KRECs) by Real-time PCR

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Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay
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Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay

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Area of Science:

  • Immunology
  • Genetics

Background:

  • Primary immune deficiency diseases (PIDs) are rare but crucial for understanding immune system function.
  • Historical classification of PIDs in the 1960s divided the immune system into humoral and cell-mediated branches.
  • PIDs present significant diagnostic and therapeutic challenges.

Purpose of the Study:

  • To present the updated classification of primary immune deficiency diseases.
  • To reflect the latest scientific understanding and molecular basis of PIDs.

Main Methods:

  • International committee of experts convenes every 2-3 years to update PID classification.
  • Discussions and consensus building among leading immunologists.
  • Review of recent research on the molecular basis of PIDs.

Main Results:

  • The molecular basis of over 100 PIDs has been elucidated in the past 15 years.
  • An updated classification of PIDs was established following the June 2003 meeting in Sintra, Portugal.

Conclusions:

  • The classification of PIDs is a dynamic process, evolving with scientific discovery.
  • Continued research into the molecular genetics of PIDs is essential for improved diagnosis and treatment.