_:vb50951231 "A bronchial disease that is characterized by chronic inflammation and narrowing of the airways, which is caused by a combination of environmental and genetic factors. The disease has_symptom recurring periods of wheezing (a whistling sound while breathing), has_symptom chest tightness, has_symptom shortness of breath, has_symptom mucus production and has_symptom coughing."^^ . _:vb50951231 "url:https://www.ncbi.nlm.nih.gov/books/NBK430901/"^^ . _:vb50951231 . _:vb50951231 . _:vb50951231 . _:vb50951231 . _:vb50951231 "url:http://www.nhlbi.nih.gov/health/dci/Diseases/Asthma/Asthma_WhatIs.html"^^ . _:vb50951231 . _:vb50951231 "url:https://www.ncbi.nlm.nih.gov/books/NBK7223/"^^ .