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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.
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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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Active versus Passive Immunity01:31

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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.
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Special Features of Adaptive Immunity01:20

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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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Functional SARS-CoV-2-Specific Immune Memory Persists after Mild COVID-19.

Lauren B Rodda1, Jason Netland1, Laila Shehata1

  • 1Department of Immunology, University of Washington School of Medicine, Seattle, WA 98109, USA.

Cell
|December 9, 2020
PubMed
Summary

Mild coronavirus disease 2019 (COVID-19) infection generates lasting immune memory. Recovered individuals maintained SARS-CoV-2-specific antibodies and memory cells for over three months, indicating potential for sustained immunity.

Keywords:
COVID-19SARS-CoV2adaptive immune responsehumanmemory B cellmemory T cellmonoclonal antibodyvaccine

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Area of Science:

  • Immunology
  • Virology
  • Epidemiology

Background:

  • The ongoing global pandemic is caused by SARS-CoV-2.
  • The long-term immunological consequences of mild COVID-19 remain unclear.
  • Understanding immune memory is crucial for assessing potential natural immunity.

Purpose of the Study:

  • To longitudinally assess the development and persistence of multifaceted immunological memory following mild COVID-19.
  • To determine if mild SARS-CoV-2 infection elicits durable immune responses.

Main Methods:

  • Longitudinal assessment of recovered individuals.
  • Measurement of SARS-CoV-2-specific immunoglobulin (IgG) antibodies and neutralizing plasma.
  • Analysis of memory B and memory T cell responses post-infection.

Main Results:

  • Recovered individuals developed persistent SARS-CoV-2-specific IgG antibodies, neutralizing plasma, and memory B and T cells for at least 3 months.
  • SARS-CoV-2-specific memory B cells increased over time.
  • Memory lymphocytes exhibited functional antiviral characteristics, including cytokine secretion by T cells and neutralizing capacity of B cells.

Conclusions:

  • Mild COVID-19 induces a multifaceted and persistent immunological memory.
  • The elicited memory lymphocytes display functional hallmarks of antiviral immunity.
  • This suggests potential for natural immunity following mild SARS-CoV-2 infection.