Table 2.
Histopathology tracheal lesion scores in broiler chicks infected with IBV IS/885 strain.
| Tracheal lesions | Broiler (days post infection) |
||||||
|---|---|---|---|---|---|---|---|
| 3 | 6 | 9 | 12 | 15 | 21 | 28 | |
| Epithelial deciliation | 1.6 ± 0.4b | 2.8 ± 0.2 | 2.4 ± 0.2 | 2.4 ± 0.4 | 2.2 ± 0.4 | 2.0 ± 0.3b | 0.0 ± 0.0 |
| Epithelial degeneration | 0.8 ± 0.2 | 1.2 ± 0.2 | 1.4 ± 0.2 | 1.8 ± 0.3 | 1.0 ± 0.0 | 1.4 ± 0.2 | 0.2 ± 0.2 |
| Decrease mucous cells | 0.2 ± 0.2b | 1.8 ± 0.5 | 1.8 ± 0.2 | 2.0 ± 0.3 | 2.8 ± 0.2 | 2.2 ± 0.3 | 0.5 ± 0.2 |
| Heterophil infiltration | 0.8 ± 0.3b | 0.8 ± 0.3 | 1.6 ± 0.5 | 1.0 ± 0.3 | 0.6 ± 0.2 | 1.2 ± 0.3b | 0.2 ± 0.2 |
| Epithelial hyperplasia | 1.2 ± 0.2 | 1.4 ± 0.2 | 1.6 ± 0.2b | 1.0 ± 0.0b | 1.0 ± 0.4 | 2.0 ± 0.0b | 1.5 ± 0.2 |
| Lymphoid infiltration | 1.0 ± 0.0b | 1.2 ± 0.2 | 1.8 ± 0.2 | 1.6 ± 0.2 | 1.6 ± 0.4 | 2.2 ± 0.2 | 1.5 ± 0.2 |
ND: not done; Data are expressed as the mean histopathological lesion score ± SEM (n = 5). Tracheal lesions scores as follows: no change (0), mild (1), moderate (2) or severe (3). For each time point and lesions, different superscripts for infected SPF (Table 2) and broiler (Table 3) chicks indicate significant differences between them (p < 0.05). Absence of a letter indicates that there were no significant differences (p > 0.05).