AHR and asthma: We also measured the AHR of asthma model mice treated with a high dose (50,000 IU IL-2(PEG):10 μg budesonide), a medium dose (25,000 IU IL-2(PEG):5 μg budesonide), a low dose (5,000 IU IL-2(PEG):1 μg budesonide) of drugs and a dose of 2,500 IU IL-2(PEG) plus 0.5 μg budesonide which failed to upregulated Treg cells in BALF.