Figure 5From: Emergency vaccination alleviates highly pathogenic porcine reproductive and respiratory syndrome virus infection after contact exposureSera IFN-γ levels detected by commercial ELISIA kit. The sera were collected from the pigs (n=5) at 0, 3, 5,7, 10, 14 and 21 DPI. Data were presented as the mean value of triplicate samples ± S.D. * means significant difference between Group 2 and 3 (P<0.05).Back to article page