Fig 4.

Viremia (A) and viral loads in 10 tissues (B) after SD-R immunization and challenge with the HP-PRRSV HuN4 strain. PRRSV viral RNA in sera and tissues was quantified by qPCR. An asterisk (*) indicates a significant difference between the immunized and challenge groups and the HuN4 challenge group (ns, P > 0.5; *P < 0.05; **P < 0.01; ****P < 0.0001). The numbers represent the number of piglets with viral loads and the number of piglets in the group. The three groups are labeled with red, blue, and black, respectively.