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| Year | Number of counties | # of birds | # of sera | # + EEE | # + SLE | #+WN |
| 1988 | 14 | 313 | 583 |
3 | 0 | 0 |
| 1989 | 13 | 0 | 699 |
4 | 0 | 0 |
| 1990 | 11 | 394 | 816 |
0 | 0 | 0 |
| 1991 | 21 | 872 | 1697 |
36 | 0 | 0 |
| 1992 | 21 | 996 | 1913 |
14 | 1 | 0 |
| 1993 | 20 | 919 | 1663 |
33 | 0 | 0 |
| 1994 | 21 | 895 | 2220 |
18 | 0 | 0 |
| 1995 | 21 | 965 | 2296 |
20 | 1 | 0 |
| 1996 | 27 | 1115 | 2772 |
15 | 0 | 0 |
| 1997 | 20 | 781 | 1774 |
18 | 5 | 0 |
| 1998 | 22 | 1214 | 2546 |
6 | 1 | 0 |
| 1999 | 21 | 854 | 2147 |
5 | 0 | 0 |
| 2000 | 19 | 821 | 1924 |
0 | 0 | 0 |
| 2001 | 25 | 1012 | 2234 |
10 | 2 | 0 |
| 2002 | 26 | 1137 | 2643 |
6 | 0 | 14 |
| Average* (1988-2002) | 12.5 | 0.7 | 7.0 | |||
| Median* (1988-2002) | 10.0 | 0.0 | 7.0 | |||
* WNV average/median: 2001-2002