Repair effect of Qinbai Qingfei concentrated pellets to AEC-Ⅱ of rats infected by Mycoplasmal pneumonia Effect of Huchang Qingfei concentrated pellets on E-cadherin expression in lung tissue of mice infected with Mycoplasma pneumoniae Study of Huchang Qingfei pellets on immune function in rats infected with mycoplasma pneumoniae