Rural to urban migration contributes to the high burden of asthma in the urban area

Introduction It is unknown whether rural‐urban migration contributes to worse the burden of asthma in the cities. Objectives The aim of this study was to evaluate whether subjects with asthma that migrated from rural areas to a large urban center in Brazil have more severe disease than asthmatic subjects that was born and always lived in the urban area. Methods This is a case‐control study. We enrolled two groups of subjects with asthma...