Detection of antibody and cellular immune responses induced by recombinant baculoviruses. A Antibody levels in sera of immunized pigs by indirect ELISA. Four groups of pigs were intramuscularly injected twice with commercial vaccine C-strain, BV-VSVG-ED-pFc-CMV-S/P-E2 or BV-VSVG-ED-CMV-E2 at a 1-week interval. Serum samples from each group were collected weekly and tested. A dashed line indicates the positive cutoff value of ELISA (OD630 nm = 0.35). B IFN-γ levels in sera of immunized pigs by ELISA. Serum samples from each group were collected and tested using a commercial ELISA kit (4A Biotech, Beijing, China) for quantitative detection of pig IFN-γ. Bars with different letters were significantly different (P < 0.05).