Fig 8.
Histopathology of lung and spleen tissues in mice infected with aerosolized spores of B. cereus G9241. C57BL/6 mice (n = 20) were infected with 1 × 106 spores of B. cereus G9241 (see Fig. 7B). Immediately following challenge (A and B, 0 h) or after 24 h (C and D), 48 h (E and F), or 72 h (G and H), animals in each cohort were euthanized and necropsied, and lung or spleen tissues were prepared for histopathology. Thin sections were stained with hematoxylin-eosin and viewed by light microscopy using 400× or 1,000× (insets) magnification. Bar, 10 μm. Red arrows identify vegetative forms of B. cereus G9241. See the text for details.