FIG. 3.

Effect of spleen cell transfer and immune serum on the protective immunity against B. microti infection in mice. (A) Mice received spleen cells of mice recovered from primary infection (○) or of normal mice (□). (B) Mice received spleen cells from mice treated with anti-CD4 MAb (○), mice treated with anti-CD8 MAb (▵), or nontreated mice (□). (C) Mice received anti-B. microti immune serum (▵) or normal mouse serum (□). Each value represents mean parasitemia ± standard error of the mean. Asterisks indicate a significant difference (P < 0.05). Data are representative of three separate experiments.