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Weight changes in mice inoculated with H5N1 swine influenza viruses and a duck influenza virus. Groups of five mice were inoculated i.n. with 106 EID50 (in 50 μl) of DK/ZJ/00 (▴), SW/FJ/01(•), or SW/FJ/03 (⧫) and weighed daily for 14 days.