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Responses to PPD-A and PPD-Ba
| PPD-A result | No. (%) of animals with PPD-B result
|
Total no. (%) | |
|---|---|---|---|
| Positive | Negative | ||
| Positive | 258 (4.8) | 68 (1.3) | 326 (6.1) |
| Negative | 474 (8.7) | 4,624 (85.3) | 5,098 (93.9) |
| Total | 732 (13.5) | 4,692 (86.5) | 5,424 (100) |
Positive and negative reactions were defined as skin indurations of >4 mm and ≤4 mm, respectively. Pearson χ2 = 1,300; P < 0.001.
