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The Common Cold Is Associated With Protection From SARS-CoV-2 Infections.

Camille M Moore1,2,3, Elizabeth A Secor1, Jamie L Everman1

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|August 12, 2025
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This summary is machine-generated.

Common respiratory infections like rhinovirus may protect against severe SARS-CoV-2. Children’s frequent rhinovirus exposure may prime their defenses, explaining milder COVID-19 outcomes compared to adults.

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Area of Science:

  • Immunology
  • Virology
  • Epidemiology

Background:

  • Adults face higher risks for symptomatic and severe SARS-CoV-2 than children.
  • Children's potential protection may stem from enhanced airway antiviral defenses primed by frequent respiratory viral infections.

Purpose of the Study:

  • To investigate if common respiratory virus infections protect against SARS-CoV-2.
  • To explore airway molecular mechanisms behind this protection.

Main Methods:

  • Case-cohort and case-control analyses of the Human Epidemiology and Response to SARS-CoV-2 cohort.
  • Testing 10,493 nasal swabs from 1,156 participants for 21 respiratory pathogens.
  • RNA-sequencing of swabs before and during rhinovirus infection.

Main Results:

  • Rhinovirus infection reduced SARS-CoV-2 risk by 48% and viral load by 9.6-fold.
  • Higher pre-infection expression of 57 genes, including 24 antiviral genes, correlated with lower SARS-CoV-2 viral load.
  • Children showed higher antiviral gene expression and increased rhinovirus infection risk compared to adults.

Conclusions:

  • Rhinovirus infections induce antiviral airway gene expression, lowering SARS-CoV-2 infection risk.
  • Frequent rhinovirus infections may bolster this protective profile, contributing to milder pediatric COVID-19.
  • Findings suggest a mechanism for differential SARS-CoV-2 severity between children and adults.