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Related Concept Videos

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...
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...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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,...
Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
Innate immunity is the body's natural, nonspecific defense system that acts quickly to protect against pathogens. It incorporates physical barriers like skin and mucous membranes and cellular elements such as phagocytes and natural killer cells. This part of our immune system provides an immediate,...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...

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Related Experiment Video

Updated: May 24, 2026

A Murine Model of Fetal Exposure to Maternal Inflammation to Study the Effects of Acute Chorioamnionitis on Newborn Intestinal Development
08:50

A Murine Model of Fetal Exposure to Maternal Inflammation to Study the Effects of Acute Chorioamnionitis on Newborn Intestinal Development

Published on: June 24, 2020

Immune development in early life.

Paolo Palma1,2,3, Donna L Farber4,5, Liza Konnikova6

  • 1Centre for the Evaluation of Vaccination and Vaccine & Infectious Disease Institute at Vaccinopolis, University of Antwerp, Antwerp, Belgium. paolo.palma@uniroma2.it.

Nature Immunology
|May 22, 2026
PubMed
Summary
This summary is machine-generated.

Early life immune development is shaped by prenatal and postnatal factors, establishing long-lasting immune responses. Understanding this critical window optimizes immune health and vaccine effectiveness throughout life.

More Related Videos

Induction of Maternal Immune Activation in Mice at Mid-gestation Stage with Viral Mimic Poly(I:C)
07:13

Induction of Maternal Immune Activation in Mice at Mid-gestation Stage with Viral Mimic Poly(I:C)

Published on: March 25, 2016

Related Experiment Videos

Last Updated: May 24, 2026

A Murine Model of Fetal Exposure to Maternal Inflammation to Study the Effects of Acute Chorioamnionitis on Newborn Intestinal Development
08:50

A Murine Model of Fetal Exposure to Maternal Inflammation to Study the Effects of Acute Chorioamnionitis on Newborn Intestinal Development

Published on: June 24, 2020

Induction of Maternal Immune Activation in Mice at Mid-gestation Stage with Viral Mimic Poly(I:C)
07:13

Induction of Maternal Immune Activation in Mice at Mid-gestation Stage with Viral Mimic Poly(I:C)

Published on: March 25, 2016

Area of Science:

  • Immunology
  • Developmental Biology
  • Maternal-Fetal Medicine

Background:

  • The perinatal period is crucial for immune system development.
  • Fetal and infant immunity possess unique programs for protection and tolerance.

Purpose of the Study:

  • To integrate current knowledge on early life immune development.
  • To explore factors influencing immune specialization and function.
  • To establish a framework for promoting lifelong immune health.

Main Methods:

  • Review and integration of recent research on prenatal hematopoiesis.
  • Analysis of lymphocyte seeding and immune specialization across compartments.
  • Examination of cellular and humoral factors in blood, tissues, and breast milk.
  • Assessment of microbial colonization and environmental influences on immune function.

Main Results:

  • Early life immune trajectories are established by prenatal, maternal, and postnatal cues.
  • Immune development involves prenatal hematopoiesis, lymphocyte seeding, and specialization.
  • Factors like breast milk, microbes, and environment refine immune function.
  • Early immune programming leads to lasting immunological imprinting.

Conclusions:

  • Early life is a critical window for establishing immune set points.
  • Immunological imprinting influences host defense, vaccine response, and atopy risk.
  • Mechanistic understanding enables age-adapted strategies for immune health.