Table 2.
Correlation between serum resistance and virulence of R. anatipestifer isolates
| Serotype | Isolation site | No. of isolates (%) |
| Pharynx | Systemic |
| 1 | 18 | 2 | 20 (15.3) |
| 2 | 1 | 11 | 12 (8.9) |
| 2, 17 | 2 | 0 | 2 (1.5) |
| 2, 4, 17, 18, 21 | 2 | 0 | 2 (1.5) |
| 4, 21 | 4 | 0 | 4 (3.0) |
| 4, 13, 14 | 2 | 0 | 2 (1.5) |
| 4, 13, 21 | 6 | 0 | 6 (4.4) |
| 4, 17, 18, 21 | 12 | 0 | 12 (8.9) |
| 5 | 0 | 1 | 1 (0.7) |
| 6 | 0 | 7 | 7 (5.2) |
| 7 | 0 | 1 | 1 (0.7) |
| 11 | 8 | 8 | 16 (11.9) |
| 11, 17, 18 | 1 | 0 | 1 (0.7) |
| 13 | 10 | 0 | 10 (7.4) |
| 13, 14 | 1 | 0 | 1 (0.7) |
| 13, 18, 21 | 1 | 0 | 1 (0.7) |
| 14 | 3 | 0 | 3 (2.3) |
| 17 | 1 | 0 | 1 (0.7) |
| 19 | 5 | 0 | 5 (3.7) |
| Non-typable | 23 | 0 | 23 (17.7) |
| Total | 100 | 30 | 130 (100.0) |