Table 6.
Mean IBV ELISA antibody titres in the SPF and broiler chicks infected with IBV IS/885 strain.
| Days post infection | SPF |
Broiler |
||
|---|---|---|---|---|
| Infected | Control | Infected | Control | |
| 0 | 21 ± 9.0 | 21 ± 9.0 | 2867 ± 229 | 2867 ± 229 |
| 3 | ND | ND | 1813 ± 343 | 1809 ± 544 |
| 6 | ND | ND | 531 ± 153 | 501 ± 64 |
| 9 | ND | ND | 311 ± 85 | 282 ± 75 |
| 15 | 160 ± 64a | 4.0 ± 2.0b | 378 ± 175 | 75 ± 19 |
| 21 | 551 ± 146a | 12 ± 5.0 b | 1116 ± 129a | 19 ± 8.0b |
| 28 | 481 ± 194a | 7.0 ± 4.0b | 623 ± 35a | 10 ± 8.0b |
ND: not done. Data are expressed as the mean values ± SEM (n = 8). Data in the same row with different superscript letters are significantly different in antibody titres (p < 0.05). Absence of a letter indicates that there were no significant differences (p > 0.05) between the infected and control groups at each sampling days. The cut-off values for ELISA = 396.