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| Year | Number of counties | # of birds | # of sera | # + EEE | # + SLE | #+WN |
| 1988 | 15 | 218 | 684 |
2 | 2 | 0 |
| 1989 | 13 | 0 | 674 |
10 | 25 | 0 |
| 1990 | 18 | 626 | 1187 |
4 | 28 | 0 |
| 1991 | 14 | 755 | 755 |
2 | 2 | 0 |
| 1992 | 13 | 494 | 830 |
0 | 0 | 0 |
| 1993 | 11 | 403 | 811 |
2 | 18 | 0 |
| 1994 | 20 | 597 | 921 |
2 | 2 | 0 |
| 1995 | 19 | 625 | 1131 |
1 | 1 | 0 |
| 1996 | 14 | 479 | 1172 |
13 | 4 | 0 |
| 1997 | 17 | 560 | 1256 |
0 | 22 | 0 |
| 1998 | 19 | 665 | 1287 |
16 | 10 | 0 |
| 1999 | 17 | 595 | 1052 |
6 | 6 | 0 |
| 2000 | 12 | 380 | 588 |
1 | 3 | 0 |
| 2001 | 25 | 802 | 2112 |
7 | 0 | 12 |
| 2002 | 23 | 835 | 2248 |
2 | 0 | 87 |
| Average* (1988-2002) | 4.5 | 8.2 | 49.5 | |||
| Median* (1988-2002) | 2.0 | 3.0 | 49.5 | |||
* WNV average/median: 2001-2002