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| Year | Number of counties | # of birds | # of sera | # + EEE | # + SLE | #+WN |
| 1988 | 6 | 95 | 136 |
0 | 1 | 0 |
| 1989 | 5 | 0 | 217 |
1 | 0 | 0 |
| 1990 | 7 | 216 | 270 |
1 | 0 | 0 |
| 1991 | 12 | 385 | 720 |
1 | 2 | 0 |
| 1992 | 9 | 445 | 1019 |
2 | 0 | 0 |
| 1993 | 7 | 391 | 829 |
1 | 1 | 0 |
| 1994 | 12 | 650 | 1187 |
1 | 0 | 0 |
| 1995 | 10 | 452 | 679 |
1 | 0 | 0 |
| 1996 | 17 | 825 | 1345 |
3 | 2 | 0 |
| 1997 | 9 | 436 | 789 |
0 | 0 | 0 |
| 1998 | 14 | 668 | 1577 |
5 | 2 | 0 |
| 1999 | 9 | 481 | 830 |
3 | 0 | 0 |
| 2000 | 7 | 406 | 770 |
0 | 0 | 0 |
| 2001 | 8 | 475 | 823 |
1 | 0 | 0 |
| 2002 | 17 | 869 | 2237 |
7 | 0 | 1 |
| 2003 | 26 | 1128 | 2286 |
15 | 0 | 2 |
| Average* (1988-2003) | 2.5 | 0.5 | 0.8 | |||
| Median* (1988-2003) | 4.0 | 0.0 | 1.0 | |||
* WNV average/median: 2001-2003