TABLE 1.

Results of the gE-blocking ELISA and the gE ELISA compared to those of VNT for serum from unvaccinated herds^a

Test method	No. of serum samples with the following result:
	Positive	Doubtful	Negative
VNTb	53	0	150
gE-blocking ELISAc	45	1	157
gE ELISAd	51	0	152

^aSera from 203 cattle were tested. 

^bFor VNT, a titer of ≥1:2 indicates a positive sample and a titer of <2 indicates a negative sample. 

^cFor the gE-blocking ELISA, blocking percentages of ≥40% are classified as positive, those of ≥30% and <40% are classified as doubtful, and those of <30% are classified as negative. 

^dFor the gE ELISA, blocking percentages of ≥50% are classified as positive and those of <50% are classified as negative.