Figure 4From: The assessment of efficacy of porcine reproductive respiratory syndrome virus inactivated vaccine based on the viral quantity and inactivation methodsVirus-specific neutralization titer according to BEI-inactivated viral titers from the samples collected 22 days after challenge. The virus neutralization test titer of the 106 viral antigen-inoculated group was significantly greater than those of the 104 and 105 PFU/mL virus-inoculated groups (p < 0.05).Back to article page