Table 3.

 Detection of the challenge virus (IA04) using RRT‐PCR in oral fluids (OF) 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 OF		Heterologous OF		Homologous** OF		Overall 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
ĸ coefficient (95% CI)	1		0·74 (0·55–0·92)		0·76 (0·5–1)		0·82 (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.