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(A) Rectal temperature measurements daily for each group of pigs(n = 5)after HP-PRRSV HV strain infection. (B) Analysis of viral loads in sera from each group of pigs. (C) Survive curves of pigs in each group. Data are presented as mean ± SE (A and B). Statistical significance was analyzed by Student’s t test; *P<0.05; **P<0.01; ***P<0.001.
