Table 2.
Mortality and protection rate after challenge with the virulent HN99 strain of IBV.
| Groups |
||||
|---|---|---|---|---|
| rFPV-S1/IL18 | rFPV-S1 | S-FPV-017 | PBS | |
| Mortality (%)a | 0 (0/20)* | 5 (1/20) | 65 (13/20) | 75 (15/20) |
| Detectable IBV in kidneyb | 0/20* | 5/20 | 20/20 | 20/20 |
| Protection rate (%)c | 100* | 75 | 0 | 0 |
a
Mortality was recorded for each day after challenge and is presented as total number of dead chickens in each group.
b
Detectable IBV in kidney as determined by RT-PCR.
c
Percent protection was determined by the number of unaffected chickens/total number of chickens.
*
Statistically significant differences (P < 0.05) (compared with rFPV-S1 alone).