Figure 1. Survival times of mice infected with the 7 avian influenza virus (H5N1) isolates. Mice were intranasally inoculated with 106 50% egg infectious dose of viruses in a volume of 50 μL. A/widgeon/Hubei/EWHC/2004 (EWHC), A/chicken/Hubei/327/2004 (CKDW), and A/goose/Hubei/ZFE/2004 (GOZF) induced a 100% death rate within 4–13 days, A/chicken/Hubei/XFJ/2004 (CKXF) induced a 50% death rate, and A/duck/Hubei/XFY/2004 (DKXF), A/chicken/Hubei/TMJ/2004 (CKTM), and A/chicken/Hubei/JZJ/2004 (CKJZ) caused no clinical signs or death.
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