Figure 1From: Different clinical, virological, serological and tissue tropism outcomes of two new and one old Belgian type 1 subtype 1 porcine reproductive and respiratory virus (PRRSV) isolates Clinical scores in pigs inoculated with PRRSV 13V091, 13V117 and 07V063 are summarized. Lines represent the mean value in each group. Letters denote significant statistical differences (P < 0.05) between viral strains (a: 13V091 and 13V117, b: 13V091 and 07V063, c: 13V117 and 07V063).Back to article page