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Related Concept Videos

Immunological Memory01:23

Immunological Memory

Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature is...
Vaccines01:21

Vaccines

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 type of...
Vaccinations01:51

Vaccinations

Overview
Active versus Passive Immunity01:31

Active versus Passive Immunity

Immunity, along with the ability to limit pathogen growth to prevent significant body tissue damage, can be gained either by (1) actively developing an immune response within the individual after exposure to a pathogen or after getting vaccinated or (2) passively transferring immune components from an immune individual to one who is nonimmune. Both these forms of immunity can be found naturally and in medical practices.
Active Immunity
Active immunity refers to the resistance one develops...
Humoral Immune Responses01:36

Humoral Immune Responses

Overview
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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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Related Experiment Video

Updated: Jul 6, 2026

Opsono-Adherence Assay to Evaluate Functional Antibodies in Vaccine Development Against Bacillus anthracis and Other Encapsulated Pathogens
13:47

Opsono-Adherence Assay to Evaluate Functional Antibodies in Vaccine Development Against Bacillus anthracis and Other Encapsulated Pathogens

Published on: May 19, 2020

Sustaining immunity after immunization against encapsulated bacteria.

Geraldine Blanchard-Rohner1, Andrew J Pollard

  • 1Oxford Vaccine Group, Department of Pediatrics, University of Oxford, Oxford, UK. Geraldine.blanchardrohner@paediatrics.ox.ac.uk

Human Vaccines
|April 10, 2008
PubMed
Summary
This summary is machine-generated.

Protein-polysaccharide conjugate vaccines reduce infant mortality but offer short-term immunity. Understanding long-term immunity generation is key to improving vaccine effectiveness and scheduling for children.

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Area of Science:

  • Immunology
  • Vaccinology
  • Pediatric Infectious Diseases

Background:

  • Encapsulated bacterial infections cause significant infant mortality globally.
  • Protein-polysaccharide conjugate vaccines against Streptococcus pneumoniae, Haemophilus influenzae type b (Hib), and Neisseria meningitidis have reduced childhood diseases.
  • Infant immunization with these vaccines shows a short duration of antibody levels and effectiveness.

Purpose of the Study:

  • To investigate the generation of long-term immunity induced by protein-polysaccharide conjugate vaccines in infants.
  • To identify factors influencing the duration of vaccine effectiveness in early childhood.
  • To inform improvements in vaccine formulation and scheduling for sustained protection.

Main Methods:

  • Review of existing literature on conjugate vaccine immunogenicity and effectiveness in infants and older children.
  • Analysis of antibody persistence and booster responses following infant immunization schedules.
  • Comparative assessment of immune memory development at different age groups.

Main Results:

  • Conjugate vaccines are highly immunogenic and reduce invasive bacterial diseases.
  • Infant immunization is associated with waning antibody levels and reduced vaccine effectiveness over time.
  • Older children demonstrate more sustained protection with fewer vaccine doses.

Conclusions:

  • Long-term immunity following infant immunization with conjugate vaccines requires further understanding.
  • Optimizing vaccine formulation and scheduling is crucial for reducing infant mortality.
  • Research into sustained protection mechanisms is essential for enhancing global child health outcomes.