Table. Antibodies to PRV gE in serum from PRV-infected pigs from different provinces, China, 2012.

Sample origin province	Collection date	gE ELISA S/N ratio*
Shandong	2012 Jan	0.115
Beijing	2012 Feb	0.240
Hebei	2012 Feb	0.169
Tianjin	2012 Feb	0.171
Liaoning	2012 Mar	0.168
		0.274
		0.168
		0.173
		0.177
		0.179
		0.168
		0.158
		0.143

*S/N ratio was calculated as a ratio of the absorbance of a well with serum to the absorbance of a control well without serum. Serum with an S/N ratio of <0.60 was considered positive. PRV, pseudorabies virus; g, glycoprotein.