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| Year | Number of counties | # of birds | # of sera | # EEE+ | # SLE+ | #WN+ |
| 1988 | 9 | 205 | 568 | 0 | 0 | 0 |
| 1989 | 5 | 0 | 141 | 0 | 0 | 0 |
| 1990 | 7 | 114 | 282 | 0 | 4 | 0 |
| 1991 | 11 | 366 | 948 | 0 | 11 | 0 |
| 1992 | 7 | 280 | 496 | 1 | 0 | 0 |
| 1993 | 6 | 250 | 515 | 1 | 0 | 0 |
| 1994 | 6 | 211 | 468 | 0 | 0 | 0 |
| 1995 | 8 | 302 | 596 | 2 | 0 | 0 |
| 1996 | 15 | 470 | 671 | 0 | 0 | 0 |
| 1997 | 9 | 330 | 789 | 1 | 0 | 0 |
| 1998 | 7 | 228 | 684 | 0 | 2 | 0 |
| 1999 | 7 | 271 | 501 | 10 | 3 | 0 |
| 2000 | 6 | 192 | 340 | 1 | 1 | 0 |
| 2001 | 5 | 177 | 303 | 0 | 0 | 0 |
| 2002 | 13 | 635 | 1336 | 12 | 0 | 2 |
| Average* (1988-2002) | 1.9 | 1.4 | 1.0 | |||
| Median* (1988-2002) | 0.0 | 0.0 | 1.0 | |||
* EEE & SLE - average/median: 1988-2002; * WNV - average/median: 2001-2002