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. 2020 Jul 8;51:86. doi: 10.1186/s13567-020-00811-y

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

aNot performed.

bOne bird died before challenge.