Evaluation of complement antagonism of recombinant baculoviruses displaying complement interfering factors in serum. A Baculovirus was incubated with 40% mice serum, and then subjected to titration by end-point dilution assays. Bars denote the percentage of vector survival, which was determined as the percentage of virus titer resulting from pre-incubation with untreated compared to heat-treated serum. Bars with different letters were significantly different (P < 0.05). B Baculovirus vector survival in pig serum tested as above. Bars with different letters were significantly different (P < 0.05).