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| Virus | HI titers with antiserum to Vac-1 |
|---|---|
| A/duck/Hokkaido/Vac-1/2004 | 2,048 |
| A/duck/Hokkaido/Vac-3/2007 | 2,048 |
| A/chicken/Kumamoto/1-7/2014 | 8 |
| A/whooper swan/Hokkaido/1/2008 | 256 |
| A/whooper swan/Hokkaido/4/2011 | 128 |
| A/chicken/Yamaguchi/7/2004 | 2,048 |
| A/peregrine falcon/Aomori/7/2011 | 128 |
