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Exploring Asthma as a Protective Factor in COVID-19 Outcomes
Anthony E Quinn1, Lei Zhao2, Scott D Bell1
1Department of Microbiology, Immunology & Pathology, College of Osteopathic Medicine, Des Moines University, West Des Moines, IA 50266, USA.
International Journal of Molecular Sciences
|February 26, 2025
Summary
Asthma patients infected with SARS-CoV-2 showed better outcomes, with lower disease severity and hospitalization rates. This review explores protective mechanisms like eosinophilia and reduced ACE-2 expression in asthma that may explain these findings.
Area of Science:
- Immunology
- Pulmonology
- Virology
Background:
- Asthma is typically linked to worse outcomes in viral respiratory infections.
- However, COVID-19 (caused by SARS-CoV-2) presented a contrasting pattern in asthma patients, showing reduced disease severity and mortality.
Purpose of the Study:
- To review potential protective immunological and physiological mechanisms in asthma that may explain favorable outcomes during SARS-CoV-2 infection.
- To highlight factors that could inform asthma management in the context of viral respiratory pandemics.
Main Methods:
- Literature review and synthesis of existing research on asthma, viral infections, and COVID-19.
- Analysis of immunological responses (eosinophils, Th2 response) and physiological factors (ACE-2 expression, inhaled corticosteroids).
Main Results:
- Asthma patients exhibited lower rates of severe COVID-19, hospitalization, morbidity, and mortality.
- Potential protective factors include eosinophilia enhancing antiviral defense, inhaled corticosteroids managing inflammation, reduced ACE-2 expression limiting viral entry, and a dominant Th2 immune response counteracting severe Th1 responses seen in critical COVID-19.
Conclusions:
- Specific characteristics of asthma, such as eosinophilia, corticosteroid use, reduced ACE-2 expression, and Th2-dominant immunity, may confer protection against severe COVID-19.
- Understanding these mechanisms is crucial for managing asthma patients during viral respiratory outbreaks.
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