Fig. 2From: Production of virus-like particles of porcine circovirus 2 in baculovirus expression system and its application for antibody detectionDetermination of antibody titers in immunized mice. BALB/c mice were intraperitoneally injected with PCV-2 VLPs, and the sera of mice were prepared after four immunizations with the same dose of VLPs. The antibody titers of the sera were determined by the I-ELISA developedBack to article page