What is the "hygiene hypothesis" in asthma?
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
Keeping children's hands clean will reduce asthma rates
All of the following changes may be seen in chronic asthma except .
deposition of subepithelial collagen
epithelial desquamation
hypertrophy and hyperplasia of mucus glands
destruction of alveolar septa and pulmonary capillaries
