Table 2.
Protective efficacy of orally administered SG-based S1 vaccine (JOL2077) in brown nick layer chickens
| Groups | Recovery of virus from trachea No. positive/no. tested |
% protectiona |
|---|---|---|
| PBS | 6/6 | 0 |
| JOL2068 | 6/6 | 0 |
| JOL2077 | 2/6 | 66.7 |
Chickens were challenged with virulent IBV strain nasally at 4 weeks post-vaccination. The challenged virus was isolated from the trachea at 6th day post-challenge and the immunoprotection efficacy was assayed.
aPercent protection was determined as the number of positive chickens/total number of chickens.