Objective To investigate the efficacy and adverse effects of methotrexate(MTX) and BacilleCalmetteGuerin-polysaccharide nucleic acid(BCG-PSN) in the treatment of steroid dependent asthma.
目的研究甲氨喋呤（MTX）联用卡介苗多糖核酸（BCG-PSN）治疗激素依赖型哮喘的疗效和安全性。
2
Objective: to take a brief historic look at the use of current BacilleCalmetteGuerin (BCG) vaccine and provide the up-to-date information on the latest developments in tuberculosis vaccine research.