Table 1.

Quantitative Mean and Median ELISA OD% values.

Farm	Treatment group	Nbatches	Ntotal	Median	Mean	P
A	Vaccination	4	109	14.0	19.22	0.0144
	Non-vaccination	3	90	17.5	30.53
B	Vaccination	4	110	12.0	17.13	0.0007
	Non-vaccination	3	89	17.0	28.22
C	Vaccination	4	110	13.0	17.55	0.0005
	Non-vaccination	1	30	38.5	42.03
D	Vaccination	4	110	17.0	27.38	0.0074
	Non-vaccination	2	61	36.0	37.89