Fig. 5

Lung tissue inflammatory scores (Panels a & b) and eosinophil counts per mm length of airway wall (Panels c & d) in Sprague Dawley and Brown Norway rats exposed to silver nanoparticles at 1 and 7 days post inhalation as a function of lung deposited doses of silver. Individual data-points shown for 8–12 rats per group with horizontal bar showing mean. *P < 0.05, **P < 0.01, ***P < 0.001 versus the air only control (0) within each time-point