What is the most common infectious cause of asthma exacerbations?

The most common infectious cause of asthma exacerbations is rhinovirus. Rhinovirus is especially significant because it is frequently associated with upper respiratory infections, which can lead to increased asthma symptoms and exacerbations. This virus is also prevalent during the fall and spring months, times when asthma patients often experience worsening symptoms.

Rhinovirus infections can trigger inflammation, increased mucus production, and bronchoconstriction, all of which contribute to asthma exacerbations. Importantly, studies have shown a strong correlation between rhinovirus infections and exacerbation rates in individuals with asthma, which further solidifies its role as a leading infectious trigger.

Although other viruses like the influenza virus and respiratory syncytial virus (RSV) can lead to acute respiratory illnesses and have implications for asthma patients, they do not occur as frequently as rhinovirus in the context of asthma exacerbations. Bacterial infections can also contribute to respiratory issues but are less common as direct triggers for asthma exacerbations compared to viral infections, particularly rhinovirus. Thus, rhinovirus stands out as the most common infectious agent implicated in worsening asthma control.