Anti-sperm antibody titers in serum of male rats after immunization with sperm and adjuvant in the immature period. Values are shown as counts per second
(cps). In the control groups (A), means ± SEM are shown. Non-treated (○) and FCA (□) and ISA 71VG + LPS (◊) groups. In the FCA-treated group, a significant
difference from the other two groups was detected at 15 weeks of age. In the sperm-immunized groups (B, C and D), individual data are shown. Rats were
immunized with sperm and ISA 71VG (B), sperm and FCA (C) or sperm and ISA 71VG supplemented with LPS (D). Data for males that were sterile at 20 weeks of age
are shown with filled markers. Dashed lines in B, C and D show mean + 3 × SEM of the non-treated group.