Figure 1. In vitro killing of schistosomula in the presence or absence of cobra venom factor (CVF). Normal Mouse and baboon sera were collected from rSm-p80 immunized mice and baboons [for details, please see Ahmad et al. (Reference 17 and 21)] and serially diluted from 1:4 to 1:64. Schistosomula were separately co-cultured with medium, serum alone, heat inactive serum, or serum plus exogenous complement with or without CVF for 24 h; viability of schistosomula was checked under a microscope. The results from optimally diluted sera are shown in the histogram. NMS = normal mice serum; HIMS = heat inactive mouse serum; MS + Complement = mouse serum plus complement; MS + Complement + CVF = mice serum plus complement with CVF; NBS = normal baboon serum; HIBS = heat inactive baboon serum; BS + Complement = baboon serum plus complement; BS + Complement + CVF = baboon serum plus complement with CVF.