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| Year | Number of counties | # of birds | # of sera | # + EEE | # + SLE | #+WN |
| 1988 | 24 | 847 | 935 |
6 | 0 | 0 |
| 1989 | 16 | 0 | 873 |
12 | 0 | 0 |
| 1990 | 16 | 745 | 1172 |
2 | 158 | 0 |
| 1991 | 22 | 898 | 2005 |
16 | 11 | 0 |
| 1992 | 21 | 932 | 2079 |
13 | 1 | 0 |
| 1993 | 21 | 879 | 1820 |
8 | 13 | 0 |
| 1994 | 21 | 938 | 2591 |
22 | 5 | 0 |
| 1995 | 23 | 959 | 2471 |
15 | 1 | 0 |
| 1996 | 28 | 1090 | 2773 |
21 | 0 | 0 |
| 1997 | 21 | 882 | 2042 |
11 | 74 | 0 |
| 1998 | 25 | 976 | 2277 |
3 | 12 | 0 |
| 1999 | 24 | 912 | 2063 |
4 | 9 | 0 |
| 2000 | 26 | 1038 | 2840 |
3 | 10 | 0 |
| 2001 | 29 | 1135 | 2910 |
15 | 2 | 9 |
| 2002 | 29 | 1305 | 3462 |
5 | 0 | 196 |
| Average* (1988-2002) | 10.4 | 19.7 | 102.5 | |||
| Median* (1988-2002) | 11.0 | 5.0 | 102.5 | |||
* WNV average/median: 2001-2002