: 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.
Scientists have discovered several biological reasons why asthma might actually offer a strange kind of protection: Asthma May Not Boost Odds of Severe COVID-19
In the early days of the pandemic, fear was the constant companion for those with respiratory conditions. For individuals with asthma, the logic seemed simple and terrifying: a virus that attacks the lungs would surely be devastating for those whose lungs were already compromised. : The SARS-CoV-2 virus enters cells via a
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. For individuals with asthma, the logic seemed simple
: 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.
: 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
For most, the message is clear: staying consistent with daily medications and keeping asthma well-controlled provides a robust layer of protection, allowing many to "breathe easier" despite the ongoing presence of the virus.