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Table 1 Number of sites and incidence rate by PEDV introduction events, geographical region and intervention timeframe

From: Growing pig incidence rate, control and prevention of porcine epidemic diarrhea virus in a large pig production system in the United States

Geographic region Pre-intervention Post-intervention
Number of PEDV introductions Farm-weeks at risk Incidence rate per 100 farm-weeks (95%CI) Number of PEDV introductions Farm-weeks at risk Incidence rate per 100 farm-weeks (95%CI)
0 1 2 0 1 2
A 26 22 0 698 3.15 (2.09–4.73) 48 0 0 1297 0.00 (0.00–0.30)
B 8 1 0 118 0.85 (0.15–4.64) 6 3 0 285 1.05 (0.36–3.05)
C 42 8 0 916 0.87 (0.44–1.71) 47 3 0 1695 0.18 (0.06–0.52)
D 8 0 0 160 0.00 (0.00–2.34) 8 0 0 296 0.00 (0.00–1.28)
E 18 14 0 543 2.58 (1.54–4.28) 31 1 0 916 0.11 (0.02–0.62)
F 13 5 0 248 2.02 (0.86–4.63) 13 5 0 509 0.98 (0.42–2.28)
G 13 9 0 318 2.83 (1.50–5.29) 21 1 0 648 0.15 (0.03–0.87)
H 3 5 0 118 4.24 (1.82–9.54) 7 1 0 209 0.48 (0.08–2.66)
I 14 21 1 548 4.20 (2.81–6.22) 32 4 0 1175 0.34 (0.13–0.87)
J 15 9 0 297 3.03 (1.60–5.66) 17 6 1 792 1.01 (0.51–1.98)
K 14 5 0 228 2.19 (0.94–5.03) 15 3 1 534 0.94 (0.40–2.17)
Total 174 99 1 4192 2.41 (1.99–2.92) 245 27 2 8356 0.37 (0.26–0.53)
  1. PEDV: Porcine epidemic diarrhea virus; 95%CI: 95% confidence interval