Figure 8From: 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 virus inactivation method using the samples 22 days after challenge. The virus neutralization test titer of the BEI-inactivated group was significantly greater than the formalin- and β-propiolactone-inactivated groups (p < 0.05).Back to article page