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Immune Response Against Viral Pathogens01:29

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Immunologic mediators profile in COVID-19 convalescence.

Alexander Leonardo Silva-Junior1,2, Lucas Silva Oliveira1,2, Stephanny Dias2,3

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|September 9, 2024
PubMed
Summary

COVID-19 convalescents show evolving immune responses, with anti-S IgG antibodies persisting longer for potential diagnosis. Early convalescence involves inflammation and specific immune cell shifts, transitioning to a reparative phase.

Keywords:
AntibodyBrazilImmune hallmarksSevere acute respiratory syndrome (SARS)

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Area of Science:

  • Immunology
  • Virology
  • Infectious Diseases

Background:

  • The COVID-19 pandemic caused by SARS-CoV-2 highlighted the need to understand post-infection immunity.
  • Limited data exists on the dynamics of immune responses in individuals after recovering from COVID-19.
  • Understanding long-term immunity is crucial for public health strategies and vaccine development.

Purpose of the Study:

  • To longitudinally investigate the immune dynamics in COVID-19 convalescent patients.
  • To analyze changes in immune cell populations and antibody levels over a 2-month follow-up period.
  • To identify potential biomarkers for diagnosis and understand the shift from inflammatory to reparative phases.

Main Methods:

  • A longitudinal study involving 62 COVID-19 convalescent patients and 51 healthy donors.
  • Analysis of blood cell counts, including monocyte, lymphocyte, NK cell, and dendritic cell subpopulations.
  • Measurement of serum cytokines, chemokines, growth factors, and anti-N/anti-S IgG/IgM antibodies using statistical analysis (Kruskal-Wallis, linear regression).

Main Results:

  • Anti-S IgG antibodies were present in over 80% of convalescents by day 30, showing longer persistence than anti-S IgM.
  • Anti-N IgG levels decreased over time, with a 13% loss of seroreactivity.
  • Early convalescence showed increased inflammatory markers (neutrophil-to-lymphocyte ratio, IL-15, myeloid DCs, B1 lymphocytes, monocytes), shifting to a cytotoxic profile (T lymphocytes, plasmacytoid DCs, VEGF) later.

Conclusions:

  • Anti-S IgG antibodies demonstrate sustained presence, suggesting their utility as a diagnostic marker for past SARS-CoV-2 infection.
  • The immune system transitions from an initial inflammatory state to a reparative dynamic post-COVID-19 recovery.
  • Further research into immunological markers can enhance understanding of adaptive immunity for improved immunizations and public health policies.