Western blot analysis showed IDO protein was elevated at 1, 3, 5d after A. fumigatus infection compared with control group. At 3d and 5d, IDO protein was higher than that of 1d. The data were indicated as the mean±standard deviation of four independent experiments. (aP<0.01, bP<0.001 compared with control; cP<0.05, dP<0.01, compared with 1d group).