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Immunological Memory01:23

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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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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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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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Humoral and Memory B Cell Responses Following SARS-CoV-2 Infection and mRNA Vaccination.

Martina Bozhkova1,2, Ralitsa Raycheva3, Steliyan Petrov1,2

  • 1Department of Medical Microbiology and Immunology-"Prof. Dr. Elissay Yanev", Medical University of Plovdiv, 4002 Plovdiv, Bulgaria.

Vaccines
|August 28, 2025
PubMed
Summary

mRNA vaccines and natural SARS-CoV-2 infection generate comparable memory B cell responses. mRNA-1273 showed more durable immunity than BNT162b2, emphasizing vaccine platform impact on immune memory.

Keywords:
B cell memoryBNT162b2COVID-19SARS-CoV-2antigen-specific B cellshumoral immune responsemRNA-1273

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Area of Science:

  • Immunology
  • Vaccinology
  • Virology

Background:

  • Assessing long-term immune memory post-SARS-CoV-2 infection and vaccination is crucial for public health.
  • Waning antibody levels raise concerns, but memory B cells (MBCs) and T cells are key to sustained immunity.

Purpose of the Study:

  • To longitudinally evaluate the duration and quality of immune memory following SARS-CoV-2 infection and mRNA vaccination.
  • To compare immune responses induced by natural infection versus BNT162b2 and mRNA-1273 vaccines over 12 months.

Main Methods:

  • A 12-month prospective study of 285 participants post-infection or mRNA vaccination (BNT162b2, mRNA-1273).
  • Blood samples collected at baseline, 1-2, 6-7, and 12-13 months.
  • Immune response assessed via anti-RBD IgG, neutralizing antibodies, B-ELISPOT, and flow cytometry for S1-specific MBCs.

Main Results:

  • Both mRNA vaccines induced superior B cell and antibody responses compared to natural infection.
  • Memory B cell frequencies peaked at 6 months, declining by 12 months but remaining elevated.
  • mRNA-1273 demonstrated stronger, more durable immunity than BNT162b2; natural infection yielded heterogeneous memory.

Conclusions:

  • mRNA vaccination and natural infection induce comparable memory B cell subset expansion.
  • Vaccination is vital for sustained immunological memory against SARS-CoV-2.
  • Vaccine platform and dosage significantly influence the magnitude and durability of immune responses.