Table 1.
Autopsy and tuberculosis culture results for guinea pigs that were killed after administration of a monthly tuberculin purified protein derivative (PPD) skin test or that died between skin tests (intercurrent deaths).
| Positive autopsy results |
Negative autopsy results |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| PPD status | Pulmonary primary focus present |
Primary focus absent |
Total no. of guinea pigs |
Culture- positive |
Culture- negative |
No culturea |
Total no. of guinea pigs |
Total no. of guinea pigs |
|||
| Culture- positive |
Culture- negative |
No culturea |
Culture- positive |
Culture- negative |
|||||||
| Positive | 116 | 3 | 2 | 4 | 0 | 125 | 4 | 30 | 0 | 34 | 159 |
| Negative | 6 | 1 | 0 | 0 | 0 | 7 | 2 | 98 | 1 | 101 | 108 |
| Intercurrent deaths | 1 | 0 | 3 | 0 | 0 | 4 | 2 | 18 | 1 | 21 | 25 |
| Total | 123 | 4 | 5 | 4 | 0 | 136 | 8 | 146 | 2 | 156 | 292 |
NOTE. Data are no. of guinea pigs. A positive autopsy result was defined as the presence of a macroscopic hard, white pulmonary primary focus and/or enlarged, hard, caseating bronchohilar or paratracheal lymph nodes.
a
No cultures performed for operational reasons.