Table 1.

Vaccination schedules, ciliostasis scores, protection scores, and protection % of vaccinated chickens after challenge with the wild type IB variant-2 virus.

Groups (30 bird/group)	Vaccination regime		Mean ciliostasis scorea	Protection scoreb	Protection %c
	Prime 1st day	Booster 14th day
1	IB-M41	IB-Var2	11.5	67.6	100
2	IB-Var2	IB-Var2	9.5	73.2	100
3	IB-Var2	IB-M41	15.5	56.3	80
4	IB-Ma5	IB-793B	17.5	50.7	60
5	IB-793B	IB-793B	21.0	40.8	50
6	IB-793B	IB-Ma5	26.5	25.4	50
7	No vaccine challenge		35.5	0.0	0.0
8	No vaccine No challenge		4.0	NA	NA

^aMean ciliostasis score/bird for the 5 tracheas examined in each group.

^b$protectionscore=\left(1-\frac{meanciliostsisscoreforvaccinatedchallenged}{meanciliostsisscoreforchallengedgroup}\right)\times 100$.

^c% of protected chicks: an individual chick was recorded as protected against challenge if the ciliostasis score <20.