TABLE 9.
Comparison of the elastase test and the gelatin gel test using 56 D. nodosus isolates obtained from flocks 27, 28, 29, 30, 31, and 32a
| Laboratory diagnosis | No. of isolates with a laboratory diagnosis (elastase test) of:b |
||
|---|---|---|---|
| Benign | Virulent | Total | |
| Benign | 28 | 1 | 29 |
| Virulent | 21 | 6 | 27 |
| Total | 49 | 7 | 56 |
a
All of these flocks presented with clinically benign footrot (see Table 1). McNemar's χ2 = 18.18, P < 0.0001, kappa statistic = 0.193 (95% CI, 0.015–0.370).
b
Benign, isolates that were elastase negative at ≤12 days; virulent, isolates that were elastase positive at ≤12 days.