(A) Flow cytometric analysis of peripheral blood B lymphocytes in scid, nude and BALB/c mice; peripheral blood was recovered at 43 days p.i… Presented are, % of cells in the CD45R gate as mean from one of two experiments), with 4 mice per group. (B) Sizes of parasites from scid and nude mice were measured from digital micrographs. (C) Total number of worms and worm pairs recovered from scid, nude, or BALB/c mice were compared at 29, 36, 43 days p.i… Data are represented as median± SEM. (D) Egg production by schistosome pairs, as in C. (E) IL-10 cytokine secretions, measured by ELISA, in scid (white bars), nude (gray bar) and BALB/c (black bar) mice at 29, 36, 43 days p.i. (F) Representative micrographs of parasites recovered from BALB/c mice, nude mice, or scid mice at the time points indicated p.i. (10× magnification).