Figure 5From: The assessment of efficacy of porcine reproductive respiratory syndrome virus inactivated vaccine based on the viral quantity and inactivation methodsPRRSV-specific IDEXX ELISA S/P ratio with 3 shots of experimentally inactivated PRRSV vaccine, according to inactivation method (BEI, formalin, and β-propiolactone). Vaccines were injected 3 times (day 0, 14, and 28).Back to article page