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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
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Updated: Oct 7, 2025

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Innate immunological pathways in COVID-19 pathogenesis.

Søren R Paludan1, Trine H Mogensen1,2

  • 1Department of Biomedicine, Aarhus University, Aarhus, Denmark.

Science Immunology
|January 7, 2022
PubMed
Summary

This review explores how SARS-CoV-2 triggers innate immune responses in COVID-19 patients. Understanding these pathways is key to developing treatments for viral infections and balancing protective versus harmful immune reactions.

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Area of Science:

  • Immunology
  • Virology
  • Genomics

Background:

  • Coronavirus disease 2019 (COVID-19) exhibits significant innate immune system dysregulation.
  • Single-cell omics studies have generated detailed cellular atlases of COVID-19, revealing insights into disease mechanisms.

Purpose of the Study:

  • To review the emerging understanding of innate immunological pathways in COVID-19.
  • To focus on SARS-CoV-2 activation of pattern recognition receptors and subsequent immune responses in the lung.

Main Methods:

  • Review of current scientific literature on COVID-19 immunology.
  • Analysis of single-cell omics data and virus-host interactions.

Main Results:

  • SARS-CoV-2 and host molecules activate pattern recognition receptors, leading to interferon and cytokine responses.
  • These responses can be protective or pathological, particularly in critical COVID-19 lung disease.
  • Virus-host interactions and stress-sensing pathways modulate these immune responses.

Conclusions:

  • In-depth understanding of COVID-19 immune mechanisms can identify therapeutic targets.
  • Elucidating the balance between protective and pathological immune responses is crucial for treating COVID-19 and other viral infections.