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The ex vivo and in vivo reactivation of Giardia muris cysts and Cryptosporidium parvum oocysts after exposure to different doses of ultraviolet (UV) radiation was determined using animal infectivity. The infectivity of UV-treated parasites stored for 1–4 days (G. muris) or 1–17 days (C. parvum) at room temperature in the dark was similar to that of organisms administered immediately after UV treatment,...
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