Table 2.

Distribution of PRRS ELISA S:P values in sows, gilts, and pre-weaning pigs.

Sample Collection Time	Sows and Gilts						Pre-Weaning Pigs
	S:P Value		Distribution of S:P Values				S:P Value		Distribution of S:P Values
	Mean	Range	<0.4	0.4–1.0	1.1–2.0	>2.0	Mean	Range	<0.4	0.4–1.0	1.1–2.0	>2.0
5th week *	1.97	0.87–2.83	0/30	3/30	9/30	16/30	1.66	0.22–2.37	6/30	11/30	9/30	4/30
14th week	1.713	0.43–1.8	1/30	9/30	24/30	0/30	0.67	0.24–1.84	16/50	21/50	8/50	5/50
26th week	0.78	0.23–1.7	11/30	17/30	5/30	0/30	0.49	0.16–0.87	42/50	8/50	0/50	0/50
38th week	0.35	0.28–1.1	20/30	7/30	3/30	0/30	0.26	0.08–0.52	48/50	2/50	0/50	0/50
50th week	0.31	0.31–0.89	29/30	1/30	0/30	0/30	0.21	0.03–0.37	50/50	0/50	0/50	0/50
62nd week	0.16	0.12–0.34	30/30	0/30	0/30	0/30	0.17	0.04–0.33	50/50	0/50	0/50	0/50

*: The time indicates the weeks post-PRRSV outbreak.