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Sentinel chickens seroconversions |
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December 1999 |
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| Year | Number of birds | # + EEE | # + SLE |
| 1988 | 218 | 2 | 2 |
| 1989 | na | 10 | 25 |
| 1990 | 626 | 4 | 28 |
| 1991 | 755 | 2 | 2 |
| 1992 | 494 | 0 | 0 |
| 1993 | 403 | 2 | 18 |
| 1994 | 597 | 2 | 2 |
| 1995 | 625 | 1 | 1 |
| 1996 | 479 | 13 | 4 |
| 1997 | 560 | 0 | 22 |
| 1998 | 665 | 16 | 10 |
| 1999 | 595 | 6 | 6 |
| Average (1998-98) | 4.7 | 10.4 | |
| Median (1998-98) | 2.0 | 4.0 | |
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