Table 1.

Number and status of animals tested for the presence of SBV-specific antibodies at every sampling time point

	number of samples (positive/doubtful/negative)
status at first sampling	Dec 11/Jan 12	Jan 13	Dec 13	Dec 14	Dec 15	Dec 16	Dec 17
Positive	17/0/0	17/0/0	15/1/1	14/1/2	15/0/2	14/2/1	14/0/3
Negative	0/0/6	2/0/4	2/0/4	2/0/4	1/0/5	1/0/5	1/0/5
Positive		15/0/0	14/1/0	14/1/0	13/0/2	11/1/3	11/0/4
Negative		0/0/0	0/0/0	0/0/0	0/0/0	0/0/0	0/0/0
Positive			13/0/0	13/0/0	11/1/1	11/0/2	9/2/2
Negative			0/0/12	0/0/12	0/0/12	5/0/7	5/0/7
Positive				2/0/0	1/0/1	2/0/0	1/0/1
Negative				0/0/26	0/0/26	7/0/19	7/0/19
Positive					0/0/0	0/0/0	0/0/0
Negative					0/0/62	1/0/61	1/0/61
Positive						29/2/0	28/1/2
Negative						0/0/35	0/0/35
First sampled in 2017 (animals < 36 months of age)							37/1/41
> 36 months of age in 2017, but not consistently sampled in previous years							14/2/6