Related Experiment Video
Updated: Aug 5, 2026
08:52
Evaluation of Host-Pathogen Responses and Vaccine Efficacy in Mice
Published on: February 22, 2019
Vaccine Responses in Early Age
Swetha Parvathaneni1, Jiro Sakai1, Lunhua Liu1
1US FDA/CBER/OVRR/DBPAP, Silver Spring, MD 20993, USA.
Vaccines
|July 27, 2026
Summary
Infants have weaker immune responses, impacting vaccine effectiveness. Understanding these age-specific differences in immunity is key to developing better pediatric vaccines and adjuvants.
Area of Science:
- Immunology
- Vaccinology
- Pediatrics
Background:
- Neonates and infants possess distinct immune systems compared to adults, leading to increased infection susceptibility and reduced vaccine efficacy.
- Developmental constraints impact both innate and adaptive immunity in early life, affecting responses to vaccines.
Purpose of the Study:
- To elucidate the age-specific immune responses to vaccines and adjuvants in neonates and infants.
- To identify strategies for developing safe and effective pediatric vaccines tailored to early-life immune characteristics.
Main Methods:
- Review of existing literature on neonatal and infant immune responses, including T cell-independent (TI) and T cell-dependent (TD) immunity.
- Analysis of factors affecting B cell responses, such as TACI expression, BCR signaling, and regulatory B cells.
- Examination of neonatal innate immune alterations, including dendritic cell subsets and cytokine production.
- Consideration of adjuvant effects on pediatric vaccine responses and potential long-lasting programming effects.
Main Results:
- Neonatal immune responses are characterized by impaired TI and TD responses, Th2 bias, restricted T follicular helper (Tfh) cell development, and delayed germinal center (GC) B cell maturation.
- Neonatal innate immunity shows altered dendritic cell (DC) distribution, reduced IL-12p70, lower MHC class II and co-stimulatory molecule expression, and increased IL-10 secretion.
- Adjuvants show promise in animal models but require detailed mechanistic studies due to potential age-specific in vivo differences and long-lasting programming effects.
Conclusions:
- Early-life immune system constraints necessitate age-tailored vaccine strategies.
- Further research into the specific mechanisms of neonatal immunity and adjuvant interactions is crucial for optimizing pediatric vaccine development.
- Understanding these age-specific immune responses will guide the creation of safer and more effective vaccines for infants.
Keywords:
CD4+ cellsT cell-dependent responseT cell-independent responseT follicular helper cellsadjuvantscytokinesgerminal center B cellsinnate immune responseneonatal vaccinesMore Related Videos
08:13Optimized Interferon-gamma ELISpot Assay to Measure T Cell Responses in the Guinea Pig Model after Vaccination
Published on: January 20, 2019
09:37Detection of Polyfunctional T Cells in Children Vaccinated with Japanese Encephalitis Vaccine via the Flow Cytometry Technique
Published on: September 23, 2022
Related Concept Videos
01:51Vaccinations
Overview
01:21Vaccines
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...
01:22Development 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...
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...
01:23Immunological 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...
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...
01:36Humoral Immune Responses
Overview
01:17Poliomyelitis
Poliomyelitis is caused by poliovirus, a small, non-enveloped, positive-sense RNA virus of the Picornaviridae family and Enterovirus genus. Transmission occurs primarily via the fecal-oral route, often through ingestion of contaminated water or food. The virus initially replicates in the oropharynx and intestinal mucosa, particularly in lymphoid tissues such as the tonsils, Peyer’s patches, and regional lymph nodes. Primary viremia follows, allowing dissemination throughout the body.In most...