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Sentinel chickens seroconversions |
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November 1999 |
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| Year | Number of birds | # + EEE | # + SLE |
| 1988 | 546 | 7 | 2 |
| 1989 | na | 2 | 44 |
| 1990 | 784 | 4 | 149 |
| 1991 | 653 | 0 | 6 |
| 1992 | 667 | 10 | 1 |
| 1993 | 752 | 2 | 39 |
| 1994 | 890 | 14 | 21 |
| 1995 | 1024 | 11 | 23 |
| 1996 | 859 | 17 | 6 |
| 1997 | 688 | 5 | 76 |
| 1998 | 1087 | 25 | 53 |
| 1999 | 946 | 5 | 44 |
| Average (1998-98) | 8.8 | 38.2 | |
| Median (1998-98) | 7.0 | 23.0 | |
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