Prevalence of hepatitis E virus antibodies in pigs in Northern Italy

Figures & data

Table 1. Number of positive serum samples displayed by productive age

Productive age	Positive samples	Seroprevalence 95% CI	OR 95% CI	P
Sow	447/633	70.6% (67–74.1%)	4.7 3.7–5.9	<0.00001
Weaner (up to 2 months)	7/58	12.1% (3.7–20.4%)	0.1 0.05–0.3	<0.00001
Slips (2–3 months)	41/133	30.8% (23–38.7%)	0.4 0.3–0.6	<0.00001
Fattening (4–6 months)	135/325	41.5% (36.2–46.9%)	0.6 0.5–0.8	0.0005
Finisher (over 6 months)	84/273	30.8% (25.3–36.2%)	0.4 0.3–0.5	<0.00001
Total	714/1422	50.2% (47.6–52.8%)

Table 2. Seroprevalence in different type of herd, displayed by productive age

Farm type	Farrow-finish (10 herds)			Farrow-weaning (17 herds)			Fattening (12 herds)
Prevalence	61.2% 95% IC 55.8–66.6			70.5% 95% IC 66.3–74.6			30.3% 95% IC 26.8–33.9
Productive age	Sow	Fattening	Finisher	Sow	Slips	Weaner	Slips	Fattening	Finisher
Tested sera	182	91	32	451	23	58	110	234	241
Positive sera	129	44	12	318	16	7	25	91	72
Prevalence IC 95%	70.9% 64.3–77.5	48.3% 38–58.6	37.5% 20.7–54.3	70.5% 66.3–74.7	69.6% 50.8–88.4	12.1% 3.7–20.4	22,7% 14.9–30.5	38.9% 32.6–45.1	29,9% 24.1–35.6

Table 3. Seroprevalence in farms according to the herd size

Herd size	Seroprevalence (95% IC)	OR (95% IC)	P
<1000	51.2% (45.8–56.8)	1.1 (0.8–1.4)	0.70
1000–4000	40.7% (37.4–44.1)	0.4 (0.3–0.5)	<0.0001
>4000	75.1% (70.2–80)	3.9 (2.9–5.2)	<0.0001