Table 2.

Overview of the statistical analyses (95% CI in brackets).

Group	Infectious period (day)		Transmission rate (β, 1/day)	Reproduction ratio (R)
	Challenged group	Contact group
Unvaccinated broilers	3.55 (3.11–3.99)	3.42 (2.68–4.16)	0.54 (0.34–0.85)	1.84 (1.11–3.06)
Unvaccinated layers	4.55 (4.19–4.91)	4.70 (2.73–6.67)	0.15 (0.08–0.27)	0.69 (0.33–1.44)