There were no OBs produced by occlusion positive recombinant viruses containing the mature toxin gene (ba3) or the toxin gene fused to insect- or baculovirus-derived signal peptide (spb-ba3and spe-ba3) during in vitro (Figure S4) or in vivo (Table 1) infection where as the control virus (vAc/occ+) did. Here, SFTPB is linked to infection.