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| Year | Number of counties | # of birds | # of sera | # EEE+ | # SLE+ | #WN+ |
| 1988 | 10 | 192 | 258 | 5 | 0 | 0 |
| 1989 | 4 | 0 | 132 | 0 | 1 | 0 |
| 1990 | 6 | 83 | 119 | 1 | 1 | 0 |
| 1991 | 10 | 331 | 685 | 3 | 6 | 0 |
| 1992 | 6 | 252 | 372 | 1 | 0 | 0 |
| 1993 | 5 | 224 | 367 | 1 | 0 | 0 |
| 1994 | 7 | 193 | 439 | 1 | 0 | 0 |
| 1995 | 6 | 214 | 262 | 0 | 0 | 0 |
| 1996 | 14 | 402 | 744 | 1 | 1 | 0 |
| 1997 | 6 | 236 | 565 | 1 | 0 | 0 |
| 1998 | 6 | 191 | 531 | 0 | 2 | 0 |
| 1999 | 7 | 235 | 417 | 12 | 2 | 0 |
| 2000 | 7 | 197 | 409 | 0 | 0 | 0 |
| 2001 | 5 | 237 | 444 | 0 | 1 | 0 |
| 2002 | 15 | 753 | 1544 | 4 | 0 | 0 |
| Average* | 2.0 | 0.9 | 0.0 | |||
| Median* (1988-2002) | 1.0 | 0.0 | 0.0 | |||
* EEE & SLE - average/median: 1988-2002
* WNV - average/median: 2001-2002