Cytospin preparations of bone marrow cells. Diff-Quik–stained cells from wild-type (A) and IL-5–deficient (B) mice evaluated 8 weeks after inoculation with S mansoni. Eosinophils are indicated at the arrows. (C) Percentage of mature eosinophils detected in bone marrow from S mansoni–infected wild-type and IL-5–deficient mice at zero and 8 weeks after inoculation. Each bar represents average ± SE of absolute counts per 1000 cells from 3 mice of each of the conditions; statistical significance, *P < .01, S mansoni-infected wild-type mice versus any of the other 3 conditions.