Attenuation and Immunogenicity of a Live High Pathogenic PRRSV Vaccine Candidate with a 32-Amino Acid Deletion in the nsp2 Protein

Figure 5

Level of viral titers on Marc-145 cells in the serum at each collection time point. The data were expressed as the geometric mean ± S.D. from 5 pigs in each group. No PRRSV was detected from any of the samples collected from pigs in the mock infected group.