IL4 and infection: It was found that the level of IFN-γ and IFN-γ/IL-4 in the serum of the two groups increased after treatment, the level of IL-4 decreased after treatment, the observation group had higher serum level of IFN-γ and IFN-γ/IL-4 and lower level of IL-4than the control group, which was also its internal mechanism of inhibiting infection.