Risk factors for porcine reproductive and respiratory syndrome virus infection and resulting challenges for effective disease surveillance

Table 4 Risk factors for PRRSV infection identified in multivariable logistic regression analysis, model adjusted for herd size and production type (outdoor/indoor), N=117, R ² =0.35

Variable name	Value	N(%)	OR	95% CI	p-value*
PRRS vaccine	none	74 (63.3)	1.0
	killed	6 (5.1)	0.5	0.1-5.6	0.55
	live	37 (31.6)	7.5	2.5-22.8	<0.01
Dead pigs disposal	incineration	38 (32.5)	1.0
	collection	79 (67.5)	5.6	1.7-18.3	<0.01
Pig density (in 10 km radius)	<15000	80 (68.4)	1.0
	≥15000	37 (31.6)	2.9	1.0-8.3	0.04
Age at weaning in days	21-27	57 (48.7)	1.0
	≥28	60 (51.3)	0.2	0.1-0.7	<0.01

ISSN: 1746-6148