Fig. 6

Comparison of immunoprotection of two different forms of VLP against PCV2 challenge. After two-time immunization with ELP-VLP or VLP, three mice from each group were challenged with PCV2b at 28 dpi. The serum samples were collected from the immunized and control mice at indicated times and assayed for PCV2 DNA copies by quantitative PCR. * and ** indicate p < 0.05 and p < 0.01 as compared with the control group