Table II.

Isolation of BVDV from buffy-coat samples from the heifers after BVDV challenge

BVDV field isolate type and heifer group	Positive results
	Day after challenge; Number of heifers							%
	0	5	6	7	8	9	10
Type 1
Vaccinated (n = 25)	0	0	1	0	0	0	0	4
Control (n = 12)	0	10	10	8	7	3	0	100
Type 2
Vaccinated (n = 28)	0	0	2	0	0	0	0	7
Control (n = 18)	0	16	17	15	13	7	1	100