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| Isolate no. | State | Date isolated |
|---|---|---|
| 1 | Michigan | 2002 Jun |
| 2 | Pennsylvania | 2002 Sep |
| 3 | New York | 2004 Mar |
| 4 | Michigan | 2005 Feb |
| 5 | Michigan | 2005 Oct |
| 6 | Michigan | 2005 Dec |
| 7 | Michigan | 2006 Oct |
