From: Risk factors for porcine reproductive and respiratory syndrome virus infection and resulting challenges for effective disease surveillance
N
Number of positive (%)
95 % Confidence Interval
All farms
131
46 (35.1)
26.8-43.4
Non-vaccinated
84
16 (19.5)
10.4-27.6
Vaccinated:
47
30 (63.8)
49.5-78.1
 Live vaccine
39
28 (71.8)
57.0-86.5
 Killed vaccine
8
2 (25.0)
13.7-63.7