TABLE 1.
Experimental design—infection status, sequence of inoculation, and number of pigs necropsied on each of three days
| Group | Infection status (day of inoculationa) | No. of pigs necropsied at:
|
Total no. of pigs necropsied | ||
|---|---|---|---|---|---|
| Day 3 | Day 10 | Day 28 | |||
| A | PRRSV (0), M. hyopneumoniae (0) | 6 | 6 | 8 | 20 |
| B | PRRSV (0), M. hyopneumoniae (−21) | 6 | 6 | 8 | 20 |
| C | PRRSV (−10), M. hyopneumoniae (0) | 6 | 6 | 8 | 20 |
| D | M. hyopneumoniae (−21) | 6 | 6 | 8 | 20 |
| E | M. hyopneumoniae (0) | 6 | 6 | 8 | 20 |
| F | PRRSV (0) | 6 | 6 | 8 | 20 |
| G | Control (0) | 6 | 6 | 8 | 20 |
a
Pigs were 6 weeks old at day 0.