Table 2.
The mortality and protection rate of different groups challenged by virulent IBV M41 strain.
| Groups | No. of death | No. of affecteda | Mortalityb (%)b | Protection (%)c |
|---|---|---|---|---|
| Group 1 | 3/15 | 5/15 | 20 | 66.7 |
| Group 2 | 1/15 | 2/15 | 6.7 | 86.7 |
| Group 3 | 1/15 | 2/15 | 6.7 | 86.7 |
| Group 4 | 5/15 | 7/15 | 33.3 | 53.3 |
| Group 5 | 4/15 | 6/15 | 26.7 | 60 |
| Group 6 | 5/15 | 8/15 | 33.3 | 46.7 |
| Group 7 | 4/15 | 6/15 | 26.7 | 60 |
| Group 8 | 10/15 | 15/15 | 66.7 | 0 |
a
Affected was determined by RT-PCR positive bird from dead and euthanized chickens’ lungs.
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.