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| Year | Number of counties | # of birds | # of sera | # + EEE | # + SLE | #+WN |
| 1988 | 24 | 790 | 1196 |
9 | 1 | 0 |
| 1989 | 18 | 0 | 1136 |
10 | 9 | 0 |
| 1990 | 16 | 711 | 1394 |
0 | 258 | 0 |
| 1991 | 22 | 866 | 2540 |
7 | 15 | 0 |
| 1992 | 21 | 928 | 2018 |
13 | 0 | 0 |
| 1993 | 20 | 860 | 2430 |
0 | 76 | 0 |
| 1994 | 21 | 876 | 2012 |
4 | 16 | 0 |
| 1995 | 29 | 1089 | 2723 |
5 | 3 | 0 |
| 1996 | 28 | 1031 | 2639 |
12 | 0 | 0 |
| 1997 | 22 | 991 | 2663 |
12 | 0 | 0 |
| 1998 | 25 | 1089 | 2976 |
1 | 60 | 0 |
| 1999 | 25 | 1029 | 2987 |
1 | 63 | 0 |
| 2000 | 27 | 1007 | 2277 |
1 | 34 | 0 |
| 2001 | 31 | 1158 | 3025 |
4 | 2 | 72 |
| 2002 | 31 | 1510 | 4008 |
5 | 0 | 308 |
| Average* (1988-2002) | 5.5 | 47 | 190 | |||
| Median* (1988-2002) | 5.0 | 15.0 | 190 | |||
* WNV average/median: 2001-2002