Table 1.

The survival rate of ducks after P. multocida challenge.

Group	No. of duck survived/challenged	Death time	Protection (%)
PBS	12/12		100
rVacJ	4/12	2-4 day	33.33
rPlpE	10/12	5、6 day	83.33
rOmpH	10/12	2、3 day	83.33
rVacJ+rPlpE +rOmpH	12/12		100
Killed vaccine	6/12	2-6 day	50
Adjuvants	0/12	2-3 day	0