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The survival rate and mean respiratory score of survived pigs. The points represent the mean (± SD) generated in all groups at the different time points after post-challenge. (A) This graph presents the time of death for the various groups by QH-08 PRRSV infection. (B) The piglets from groups 1–5 were infected with QH-08 PRRSV at 0 dpc pigs in group 1 to group 4 were significantly lower than group 5 pigs (infected control) at 2-5, 9 and 10 dpc (p < 0.001). *** p < 0.05.
