Table 4 Vaccination schedules, clinical signs and gross lesions of vaccinated chickens after challenge with QX-like IBV strain SD.
Groups | Vaccination regime | Clinical signs | Gross lesions | ||||
|---|---|---|---|---|---|---|---|
Prime1st day | Booster 21th day | Dead | Lethargic and reluctant | Respiratory symptoms | Renal enlargement/urate | Tracheal exudate/hemorrhage | |
A | Ma5 | /a | 1/9 | 2/9b | 5/9 | 2/9 | 0/9 |
B | LDT3-A | / | 0/10 | 2/10 | 1/10 | 0/10 | 0/10 |
C | QX | / | 0/10 | 0/10 | 0/10 | 0/10 | 0/10 |
D | Ma5 | H120 | 0/10 | 0/10 | 8/10 | 0/10 | 2/10 |
E | LDT3-A | H120 | 0/10 | 0/10 | 4/10 | 1/10 | 2/10 |
F | QX | H120 | 0/10 | 0/10 | 0/10 | 2/10 | 1/10 |
G | QX | QX | 0/10 | 0/10 | 2/10 | 1/10 | 2/10 |
H | No vaccine challenge (day 21) | 4/10 | 7/10 | 4/10 | 4/10 | 2/10 | |
I | No vaccine challenge (day 35) | 0/10 | 0/10 | 9/10 | 0/10 | 5/10 | |
J | No vaccine No challenge | 0/10 | 0/10 | 0/10 | 0/10 | 0/10 | |