|Print Window||Close Window|
Figure 8: Factors involved in induction and exacerbation of asthma. Induction of asthma may occur in genetically susceptible people upon exposure to common allergens or certain chemicals. Nonspecific irritants and promoters may facilitate induction through injury and increased uptake of allergens or by modulating immune responses (dashed arrow). Both allergens and irritants may exacerbate existing asthma.