The common cold as a trigger of asthma.

Area of Science:

• * Virology and Immunology
• * Respiratory Medicine
• * Pediatrics and Adult Asthma

Background:

• * The common cold, a prevalent upper respiratory viral illness, is primarily caused by rhinovirus.
• * Rhinovirus transmission occurs through direct contact, leading to nasal epithelial cell release of IL-8 and neutrophil-driven inflammation.
• * Common colds are significant triggers for asthma exacerbations in both children and adults.

Purpose of the Study:

• * To elucidate the mechanisms by which rhinovirus infection induces airway inflammation and asthma exacerbations.
• * To investigate the poorly understood interplay between virus-induced inflammation and asthma pathogenesis.
• * To evaluate the evidence supporting the common clinical practice of using oral and inhaled corticosteroids for cold-induced asthma exacerbations.

Main Methods:

• * Review of existing literature on rhinovirus infection, common cold symptoms, and asthma exacerbations.
• * Analysis of the inflammatory pathways triggered by rhinovirus, including IL-8 and neutrophil involvement.
• * Examination of current treatment protocols for asthma exacerbations during common colds, focusing on corticosteroid use.

Main Results:

• * Rhinovirus infection leads to airway inflammation and bronchial hyperresponsiveness, precipitating asthma symptoms.
• * The precise biochemical mediators responsible for common cold nasal symptoms remain unidentified.
• * The efficacy of corticosteroid treatment for common cold-induced asthma exacerbations lacks robust placebo-controlled trial data.

Conclusions:

• * Rhinovirus-induced airway inflammation is a key factor in asthma exacerbations.
• * Further research is needed to understand the specific mechanisms linking viral infections to asthma.
• * The current standard practice of corticosteroid use in managing cold-induced asthma exacerbations requires validation through rigorous clinical trials.