Table 1.
The mortality and protection rate of different groups challenged by virulent strain SIBK of IBV
| Groups | No. of death | No. of affecteda | Mortalityb (%) | Protection ratec (%) |
|---|---|---|---|---|
| pIRES-N/IL2 | 1/20 | 4/20 | 5 | 80 |
| pIRES-N | 3/20 | 10/20 | 15 | 50 |
| pIRES | 11/20 | 20/20 | 55 | 0 |
| PBS | 13/20 | 20/20 | 65 | 0 |
a
Affected was determined by RT-PCR positive bird from dead and euthanized chickens’ kidneys.
b
Mortality was recorded for each day after challenge and is presented as total number of dead chickens in each group.
c
Percent protection was determined by the number of unaffected chickens/total number of chickens.