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