Survival times of different mouse strains exposed to prion aerosols for various periods.

Upper panel: survival times of tga20 mice after 10-min exposure to aerosols generated from various concentrations of IBH. Lower panel: survival times of various mouse strains after exposure for 1, 5, or 10 min to infectious aerosols. Selected inoculations were repeated sequentially (asterisks) in order to estimate the reproducibility of these results.