Fig. 6From: Construction of a quadruple gene-deleted vaccine confers complete protective immunity against emerging PRV variant challenge in pigletsWeight gain of piglets in all groups was recorded after PRV GDFS challenge. Body weights of all pigs were individually measured at 0 DPC (challenge) and 14 DPC (necropsy). All data are ex-pressed as mean ± SEM. The asterisk (*) indicate statistically significant differences between dif-ferent groups (P < 0.05)Back to article page