Fig. 3

Pathological damage of lung tissues. Lungs were harvested on day 42 post-RSV infection, stained with hematoxylin-and-eosin (HE), and scored for levels of inflammation as described in the Materials and Methods section. Representative HE staining of mouse lung tissue sections (original Magnification × 200) were shown. a: control group; b: RSV group; c: LPS group; d: RSV + LPS group. Histological scores (HPS) were assessed (e). Graphs are represented as the mean ± sem. Data are representative of two independent experiments performed on 6 animals per group. *, p < 0.05, ***, p < 0.001, shown comparing the control group with the other groups; ###, p < 0.001, shown comparing the RSV + LPS group with the LPS group; ^^, p < 0.01, shown comparing the RSV + LPS group with the RSV group