Table 3.

Detection of the challenge virus (IA04) using RRT-PCR in oral fluids from the control, heterologous, homologous, and all groups combined. Information is presented in 2 by 2 tables. Results from the seeder pigs are included.

Pen Status‡	Control		Heterologous		Homologous*		Overall
	OF		OF		OF		OF
	Positive	Negative	Positive	Negative	Positive	Negative	Positive	Negative
Positive	12	0	19	6	6	3	37	9
Negative	0	3	0	21	0	35	0	59
Total	12	3	19	27	6	38	37	68
K coefficient	1		0.74		0.76		0.82
95% CI			0.55–0.92		0.5–1		0.71–0.93

^‡Number of positive pens, with pens defined as positive if ≥ 1 nasal swab tested positive by RRT-PCR.

^*Positive results from the homologous group originated only from the seeder pigs.