FIG. 10.

Transfer of primed serum to CBA/N mice. Thirty-five CBA/Ca mice were immunized with 40 B. pahangi L3. Mice were bled by cardiac puncture at 3 weeks postinfection; serum was collected by centrifugation and pooled. Five CBA/Ca mice were infected with 45 B. pahangi L3 and injected i.p. with 240 μl (the volume-equivalent of serum that we usually recover from a single mouse) of pooled serum on days 0, 2, 4, 6, 8, 10, and 12 postinfection. The control groups of CBA/N mice received no treatment (No Tx) or were injected with 240 μl of pooled serum from B. pahangi-infected B6 Igh6^−/− mice (n = 5 for each group). All mice were necropsied on day 14 postinfection and worm burdens were quantitated.