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Updated: Feb 15, 2026
09:23
Methodology for Developing Life Tables for Sessile Insects in the Field Using the Whitefly, Bemisia tabaci, in Cotton As a Model System
Published on: November 1, 2017
12.6K
[Development of specific immunity in prenatal life]
1Inserm U429, hôpital Necker-Enfants-Malades, 149, rue de sèvres, 75015 Paris, France. durandy@necker.fr
Summary
The fetal immune system, including T and B lymphocytes, develops in utero, becoming functional by the first trimester. However, immature immune responses make neonates susceptible to infections.
Area of Science:
- Immunology and Developmental Biology
- Fetal development of specific immunity
Context:
- Specific immunity involves T lymphocytes, B lymphocytes, and antigen-presenting cells.
- Hematopoiesis occurs sequentially in the yolk sac, fetal liver, and bone marrow during gestation.
Purpose:
- To outline the developmental timeline of the fetal immune system.
- To explain the implications of early immune development on neonatal susceptibility to infections.
Summary:
- T lymphocyte differentiation begins around week 10, with mature T cells detectable by week 12.
- B cell maturation starts early in fetal life (week 12), and antigen-presenting cells are functional by 12 weeks.
- Specific immune responses are possible by the end of the first trimester, but primary responses are naive and less effective.
Impact:
- Explains the increased vulnerability of neonates, particularly premature infants, to bacterial and viral infections.
- Highlights that full immune system maturation occurs over the first few years of life through antigenic stimulation and T/B cell cooperation.
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