What is the "hygiene hypothesis" in asthma?
Keeping children's hands clean will reduce asthma rates
Frequent bathing can reduce the severity of asthma attacks
Dirty water is responsible for many cases of asthma in the developing world
Exposing children to pathogens at a young age will decrease their risk for asthma
All of the following changes may be seen in chronic asthma except .
deposition of subepithelial collagen
hypertrophy and hyperplasia of mucus glands
epithelial desquamation
destruction of alveolar septa and pulmonary capillaries
