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Development of Immunocompetence01:22

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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.
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Vaccines are among the most effective tools in preventive medicine, designed to prepare the immune system to recognize and combat infectious agents. By introducing antigens—substances that the immune system identifies as foreign—vaccines stimulate an adaptive immune response that leads to immunological memory. This immunological memory enables the body to mount a faster and more effective response upon future exposures to the actual pathogen.Vaccines can be categorized based on the...
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Transcytosis is the process in which molecules are internalized by endocytosis, transported across the cell, and released through exocytosis from the opposite end of the cell. Molecules such as insulin, immunoglobulins, and certain nutrients are transferred through the recycling endosomes by recycling and transcytosis.
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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Related Experiment Video

Updated: Apr 20, 2026

Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus
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Antenatal immunization.

Chrissie Jones1, Paul Heath

  • 1a Paediatric Infectious Diseases Research Group (PIDRG); St George's, University of London; London, UK.

Human Vaccines & Immunotherapeutics
|November 27, 2014
PubMed
Summary
This summary is machine-generated.

Maternal vaccination boosts antibodies, protecting infants from serious infections until they can be immunized. Despite safety concerns, the benefits of vaccinating during pregnancy outweigh the minimal risks, safeguarding both mother and child.

Keywords:
antenatalimmunisationinfantinfectious diseasematernalpregnancyvaccination

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Area of Science:

  • Immunology and Public Health
  • Maternal and Infant Health

Background:

  • Pregnancy and infancy involve immune suppression, increasing vulnerability to infections with high morbidity and mortality.
  • Infants face elevated risks of invasive diseases, with incidence rates of 100 per 100,000 population.

Purpose of the Study:

  • To review the rationale, concepts, and mechanisms behind maternal vaccination strategies.
  • To assess the safety of vaccination during pregnancy and address associated challenges.
  • To evaluate the protective benefits of maternal immunization for infants.

Main Methods:

  • Review of existing literature on maternal vaccination.
  • Analysis of safety data and challenges in assessing vaccine safety in pregnant women.
  • Discussion of immunological principles of passive antibody transfer.

Main Results:

  • Maternal vaccination aims to transfer pathogen-specific antibodies to the infant, providing passive immunity.
  • Safety assessments indicate that risks from disease significantly outweigh the minimal risks of vaccination during pregnancy.
  • Vaccination during pregnancy is a viable strategy for preventing serious infections in mothers and infants.

Conclusions:

  • Maternal vaccination offers a crucial method for protecting vulnerable infants before they can be immunized.
  • The safety profile supports vaccination, with disease risks being a greater concern than vaccine risks.
  • This approach presents a novel platform for enhancing protection against severe infections in early life.