FIG. 4.

Numbers of adult worms recovered from baboons 13 weeks after challenge infection with 1,000 cercariae in the first experiment. Animals were challenged with cercariae 21 days after the final immunization with various regimens, as indicated in the figure. Asterisks denote P < 0.01 compared to control groups with saline or IL-12 administered alone (Student’s t test). Each point represents a single animal.