| Legend |
| A/duck/MN/1525/1981 (H5N1) |
| A/ruddy turnstone/NJ/65/1985 (H7N3) |
| A/widgeon/OH/379/1988 (H5N2) |
| A/wood duck/OH/623/2004 (H5N1) |
| A/shorebird/DE/101/2004 (H5N7) |
| A/blue wing teal/OH/658/2004 (H7N3) |
| A/environment/MD/261/2006 (H7N3)* |
| A/shorebird/DE/22/2006 (H7N3) |
| A/environment/MD/2006 (H3N6) |
| A/mallard/MD/182/2006 (H5N2) |
| A/environment/MD/1158/2006 (H5N1)* |
| A/mallard/MD/1235/2006 (H3N6) |
| A/green wing teal/CA/609/2007 (H5N2) |
| Other |
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