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Related Concept Videos

Immunological Memory01:23

Immunological Memory

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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...
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Cells of the Adaptive Immune Response01:23

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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...
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Immune Response Against Viral Pathogens01:29

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Vaccinations01:51

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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Updated: Sep 24, 2025

Application of Long-term cultured Interferon-&#947; Enzyme-linked Immunospot Assay for Assessing Effector and Memory T Cell Responses in Cattle
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Application of Long-term cultured Interferon-γ Enzyme-linked Immunospot Assay for Assessing Effector and Memory T Cell Responses in Cattle

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Long-Term, CD4+ Memory T Cell Response to SARS-CoV-2.

Sebastian Wirsching1, Laura Harder1, Markus Heymanns1

  • 1Children's Hospital, University Medical Center of the Johannes Gutenberg University, Mainz, Germany.

Frontiers in Immunology
|May 6, 2022
PubMed
Summary

T cell immunity against COVID-19 remained stable for 3-9 months post-infection, unlike antibodies. This suggests nucleocapsid antigen inclusion in future SARS-CoV-2 vaccines for enhanced T cell memory.

Keywords:
HCoVSARS-CoV-2T cell immunitycross-reactivitylong-term memory

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Area of Science:

  • Immunology
  • Virology
  • Infectious Diseases

Background:

  • Coronavirus disease-19 (COVID-19), caused by SARS-CoV-2, rapidly became a global pandemic.
  • Understanding factors influencing protective immunity is crucial for effective pandemic response.
  • Immune responses, including T cell and antibody levels, are key to managing viral infections.

Purpose of the Study:

  • To investigate the durability and characteristics of T cell responses following SARS-CoV-2 infection.
  • To compare immune responses in convalescent healthcare workers with unexposed individuals.
  • To inform future vaccine development strategies for COVID-19.

Main Methods:

  • Recruitment of a cohort of convalescent healthcare workers.
  • Monitoring immune responses over 3 to 9 months post-symptom onset.
  • Assessing T cell responses, including CD4+ T cell counts, and comparing with antibody titers.

Main Results:

  • Demonstrated cross-reactive T cell responses to SARS-CoV-2 and endemic coronaviruses (OC43, NL63).
  • Convalescent individuals showed significantly higher SARS-CoV-2-specific CD4+ T cells compared to unexposed groups.
  • T cell immunity remained stable over the study period, contrasting with declining antibody titers.

Conclusions:

  • T cell immunity following COVID-19 is more persistent than humoral immunity.
  • A robust CD4 T cell memory response against the nucleocapsid antigen was observed.
  • Nucleocapsid antigen could be a valuable addition to spike protein in future SARS-CoV-2 vaccine designs for improved T cell memory.