Asthma May Not Boost Odds Of Severe Covid-19 Review

: People with asthma often have higher counts of eosinophils , a type of white blood cell. Research suggests these cells may help degrade viral RNA and boost the immune defense specifically against this virus.

: The SARS-CoV-2 virus enters cells via a receptor called ACE2 . In many people with allergic asthma, the expression of this receptor is naturally lower, giving the virus fewer "doors" to enter through. Asthma May Not Boost Odds of Severe COVID-19

: Daily maintenance with inhaled corticosteroids (ICS) —the standard treatment for asthma—may reduce the body's inflammatory response to the virus, potentially preventing the "cytokine storms" that lead to severe illness. A Note of Caution: Control is Key : People with asthma often have higher counts

The story isn't the same for everyone. While asthma in general may not boost the odds of severe outcomes, remains a concern. A large-scale Swedish study published in February 2026 found that patients with very poor symptom control or frequent flare-ups still faced a higher risk of hospitalization if they contracted the virus. In many people with allergic asthma, the expression