Asthma is defined as a chronic inflammatory disorder of the airways which manifests itself as recurrent episodes of wheezing, breathlessness, chest tightness and cough. It is characterized by bronchial hyper?responsiveness and variable airflow obstruction, that is often reversible either spontaneously or with treatment. The prevalence of asthma in India is about 2%, and asthma is responsible for significant morbidity. In India, the estimated cost of asthma treatment per year for the year 2015 has been calculated at about 139.45 billion Indian rupees.
Bibliographical noteFunding Information:
The work described in this paper was fully supported by the grants from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project Nos. HKU 7014/00E and CityU 1047/00E).