Table 2.
Isolation of A. pleuropneumoniae from central and peripheral organ tissues and corresponding severity of disease during acute infection
| Sample | Samples with positive isolation results (%) | Degree of re-isolation (number of animals) | Number of animals with isolation of A. pleuropneumoniae in the respective organs | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Degree of clinical disease | Degree of lung lesions | Degree of isolation from the lungs | ||||||||||||
| Low-grade | Moderate | High-grade | Mild | Moderate | Severe | Mild | Moderate | Severe | Low-grade | Moderate | High-grade | |||
| Blood; blood culture (n = 26) | 50.0 (n = 13) | – | – | – | 4 | 3 | 6 | 2 | 2 | 9 | 0 | 2 | 11 | |
| Blood; direct plating (n = 23) | 43.5% (n = 10) | 2 | 5 | 3 | 3 | 3 | 4 | 2 | 2 | 6 | 0 | 2 | 8 | |
| Central organ samples | Liver (n = 47) | 61.7 (n = 29) | 15 | 8 | 6 | 14 | 3 | 12 | 5 | 10 | 14 | 1 | 8 | 20 |
| Spleen (n = 47) | 51.1 (n = 24) | 14 | 5 | 5 | 9 | 3 | 12 | 2 | 8 | 14 | 1 | 6 | 17 | |
| Kidney (n = 47) | 55.3 (n = 26) | 13 | 8 | 5 | 12 | 3 | 11 | 4 | 10 | 12 | 0 | 7 | 19 | |
| Peripheral organ samples | Tarsal joints (n = 47) | 14.9 (n = 7) | 7 | 0 | 0 | 2 | 1 | 4 | 0 | 3 | 4 | 0 | 2 | 5 |
| Carpal joints (n = 47) | 12.8 (n = 6) | 6 | 0 | 0 | 1 | 1 | 4 | 0 | 2 | 4 | 0 | 1 | 5 | |
| Meninges (n = 47) | 27.7 (13) | 10 | 3 | 0 | 4 | 1 | 8 | 2 | 2 | 9 | 0 | 4 | 9 | |