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Infectivity of leachates obtained from the columns. Survival curve of tgElk mice i.c. inoculated with leachates obtained at the second week from columns with quartz (Qz), illite, Luvisolic Ae (Luv) and Chernozemic Ah (Cher) horizon. Dilution of infective tgElk CWD-BH (0.1%, 0.01%, 0.001%) was included as a control; NBH—uninfected tgElk BH.
